Religious affiliation by age group Spain 2026

Share of population affiliated with a religious denomination in Spain in 2026, by age group

Age is the single sharpest dividing line in Spanish religion, and in 2026 the contrast between generations is stark. About 76% of people aged 65 and over are affiliated with a religion, almost all of them Catholic, against just 38% of those aged 18 to 24. In between, affiliation climbs in an almost perfect ladder, from the low forties among the under-35s to the high sixties and seventies among the over-55s. The young are now majority non-religious, the first broad cohort in modern Spanish history of which that can be said. This age gradient is the engine behind the steady national decline charted in our proportion of Catholics in Spain analysis, because as older, more religious cohorts pass on, they are replaced by far more secular ones. Demography, in other words, points firmly in one direction. The country's religious profile, in short, is being decided less by anything happening in the present than by the make-up of each new generation reaching adulthood.

The numbers describe a country splitting along generational lines. Among 18-24s, only around 38% are affiliated with any religion; the figure rises to roughly 43% for 25-34s, 53% for 35-44s and 61% for 45-54s, before reaching about 69% for 55-64s and 76% for the over-65s. The gap between the youngest and oldest groups is close to 40 percentage points, one of the widest religious age gaps anywhere in Europe. Crucially, this is a cohort effect rather than a life-cycle one: people are not simply becoming more religious as they age, but rather each generation is entering adulthood less religious than the one before and largely staying that way. That distinction matters enormously for the future, because it means the national religious majority is being slowly hollowed out from the bottom up. That hollowing-out is almost invisible in any single year's headline figure, but compounded over a decade it quietly reshapes the entire national picture.

None of this means religion has vanished from Spanish public life. The Church retains a prominent role in education, festivals and national ritual, and arguments over its place remain politically charged. But the gap between that institutional presence and the lived belief of the young keeps widening, and the age data is the clearest single measure of it. A country can keep its cathedrals full of visitors and its calendar full of saints days while the share of young people who actually believe quietly falls away beneath the surface. The two can coexist for a long time, which is exactly why the headline picture changes so slowly while the foundation underneath it shifts decisively from one generation to the next.

These figures draw on the Ferrer i Guardia Foundation and the CIS, Spain's Centre for Sociological Research, whose surveys ask respondents how they define themselves in religious matters. Here, being affiliated with a religion combines Catholics, both practicing and non-practicing, with the small share who follow other faiths, while the rest describe themselves as atheist, agnostic or indifferent. Because age breakdowns come from survey cross-tabulations, they carry wider margins of error than the national headline, and individual age bands can move from survey to survey. The overall pattern, however, is robust and consistent across sources: a steep, near-linear rise in religious affiliation with age, mirrored by a collapse of belief among the young that this report examines across categories, gender, generation and time. Treating the age bands as a snapshot of a process in motion, rather than as a fixed map, is the key to reading the figures correctly and avoiding false comfort in the still-large national majority.

Religious Affiliation in Spain by Age Group: Full Table

Laid out side by side, the two columns cross over somewhere in the late thirties. Below that age, the non-religious are in the majority; above it, the affiliated take over and their lead widens with every decade of age. The 35-44 band sits almost exactly on the dividing line, at roughly 53% affiliated against 47% non-religious, making it the hinge generation between a secular young Spain and a still-Catholic older one. The steepness of the gradient is what stands out: affiliation roughly doubles from the youngest to the oldest band, a far larger swing than for almost any other social attitude. That is why Spain's religious future is so often described as a question of demographic arithmetic, in which the make-up of each rising cohort matters more than any change of heart among those already grown. As a result, the religious balance of the country as a whole now depends largely on how numerous and how devout each incoming cohort turns out to be.

Spain's Non-Religious Young, by Age Group

Flipping the figures around shows the scale of secularisation among the young. Around 62% of 18-24s and 57% of 25-34s in Spain describe themselves as non-religious in 2026, combining atheists, agnostics and the indifferent. That share falls steadily with age, to about 47% of 35-44s, 39% of 45-54s, 31% of 55-64s and just 24% of the over-65s. In other words, the non-religious are a clear majority among the young and a clear minority among the old. This is the same generational engine that is reshaping belief across the continent, including the trends in our religion in England and Wales analysis, where the young drive the rise of the non-religious. Spain stands out only for how compressed and steep its version of the shift has become. Few other European societies show so steep a religious gradient packed into so short a span of birth years.

The cohort pattern also explains why repeated predictions of a religious revival have failed to materialise. Each time commentators have seized on a possible uptick among the young, the longer series has reasserted itself, with the next cohort arriving more secular still. Short-term wobbles in noisy survey data are easy to mistake for genuine turning points. Only a sustained rise sustained across several successive cohorts would signal a real reversal, and so far the evidence for anything of the kind remains thin. What looks like stabilisation in one barometer tends to dissolve in the next, leaving the underlying downward slope intact across the longer run of surveys, which is the trend that actually matters for the country's religious future.

How Young Spaniards Define Themselves

Breaking the under-35s into detailed categories reveals a young Spain in which active faith is marginal. Among 18-34s, only around 7% describe themselves as practicing Catholics and about 31% as non-practicing, so the Catholic label, where it survives, is overwhelmingly cultural. On the other side, atheists make up roughly a quarter of young adults, with agnostics and the indifferent adding another third between them. Believers of religions other than Catholicism, including a growing share of young Muslims and others, account for about 5%, a higher figure than among older Spaniards and one that reflects immigration, as our non-Catholic believers in Spain analysis explores. For the typical young Spaniard, in short, religion is either an inherited label worn lightly or something actively rejected, rarely a living practice. A small but rising part of that other-faith total is made up of young people of immigrant background, a comparison drawn out in our religious affiliation of foreigners in Italy analysis.

How Older Spaniards Define Themselves

The over-65s present almost the mirror image. Among them, around 30% are practicing Catholics and about 46% non-practicing, so roughly three-quarters keep the Catholic label and a substantial minority still attend Mass regularly. Atheists, agnostics and the indifferent together make up only around a fifth of older Spaniards, and believers of other faiths barely register. This generation came of age under or just after the Franco regime, when Catholicism was woven into national identity, schooling and public life, and that early formation has proved remarkably durable. The contrast with the young is the heart of the story told in our belief in God in the UK analysis of how faith is handed down, or not, between generations. As this older, devout cohort gradually shrinks, so too will the national Catholic majority it sustains, since there is no younger cohort of comparable devotion waiting to take its place.

Practicing Catholics by Age Group

If affiliation falls with youth, active practice falls even faster. Only about 6% of Spaniards aged 18 to 24 describe themselves as practicing Catholics, rising to roughly 9% of 25-34s and 12% of 35-44s, before climbing to 18%, 24% and around 30% across the older bands. So while three-quarters of the over-65s keep the Catholic label and nearly a third actively practice, among the youngest adults practice has dwindled to one in sixteen. The committed Catholic core in Spain is therefore not just smaller than the nominal majority but markedly older, a pattern that echoes the durable-but-shrinking practice we document in our Catholic weddings in Germany analysis. For the Church, the age profile of its active members is arguably a more pressing concern than the headline affiliation figures, because it points to a steep fall in practice as today's older worshippers age. The active core, in other words, is ageing even faster than the broad affiliated majority around it.

Atheism by Age Group in Spain

Outright atheism, as distinct from vague non-belief, is now strikingly common among the young. About 28% of Spaniards aged 18 to 24 describe themselves as atheists, falling to roughly 24% of 25-34s and then steadily down to about 6% among the over-65s. Younger Spaniards are not merely drifting from practice but increasingly rejecting religious belief altogether, a more decisive break than the quiet lapsing of earlier generations. This rise of confident young atheism is part of the broad secularisation reshaping the developed world, the same current traced in our world religions analysis. It also marks a generational divide in worldview, not just in churchgoing: where older Spaniards who leave the Church often retain a residual belief, the young are more likely to abandon the idea of God entirely, which makes the shift harder to reverse. That makes the youth break less a matter of lapsed habit than of a genuinely different worldview taking hold among the young.

Religious Affiliation Among Under-35s Over Time

The youth gap is not new, but it has widened sharply over the past fifteen years. The share of Spaniards under 35 affiliated with a religion has fallen from around 62% in 2011 to about 40% by 2026, a drop of more than 20 percentage points in a single generation. Each new cohort entering adulthood has been less religious than the last, so the decline reflects steady cohort replacement rather than young people simply growing out of faith. This is the leading edge of the national trend examined in our religion in Europe analysis, which places Spain among the faster-secularising societies on the continent. Some recent CIS readings hint that the fall among the very youngest may be levelling off, prompting talk of a possible floor, but it is far too early to say whether that marks a genuine turning point or a brief pause. For now the floor, if one exists at all, plainly sits far below the levels seen a single generation ago.

Religious Affiliation by Age and Gender

Gender adds a second layer to the age pattern. At every age, women in Spain are more likely than men to be affiliated with a religion, usually by around 8 percentage points. Among 18-24s, roughly 42% of women but only about 34% of men are affiliated, and the gap persists right up the age scale, so that the most religious group of all is women aged 65 and over, at around 80%. The least religious are young men, among whom non-belief is now clearly the norm. This consistent gender gap mirrors a pattern found across Europe, where women tend to sustain religious identity and practice longer than men even as overall affiliation declines. Combined with the age effect, it means the active, affiliated population in Spain is increasingly both older and more female, a profile with clear implications for the shape of parish life. The result is congregations that are visibly older and more heavily female than the population they are drawn from.

Education and geography reinforce these divides. Religious affiliation in Spain tends to be lower among the university-educated and in the largest cities, and higher in smaller towns and rural areas, layers that compound the age and gender effects rather than offsetting them. A young, urban, university-educated woman and an older, rural, less-educated man can sit at almost opposite ends of the religious spectrum. These overlapping cleavages are part of why bare national averages can feel so abstract, since the lived reality of religion in Spain depends heavily on exactly who and where you are. Age remains the strongest single predictor of the lot, but it never acts entirely alone, and the steepest declines show up where youth, higher education and big-city life all point in the same secular direction at once, while the strongest attachment survives at the opposite corner of that map.

Religious Affiliation by Generation

Grouping Spaniards into generations rather than age bands makes the divide even clearer. Only about 39% of Generation Z are affiliated with a religion, against roughly 48% of Millennials, 60% of Generation X, 72% of Boomers and around 80% of the Silent Generation. Each successive generation is markedly more religious than the one that followed it, a textbook cohort gradient. Because affiliation appears to be largely set in early adulthood and to change only slowly thereafter, these generational differences are likely to persist as each cohort ages, much as migration-driven religious change persists in the communities described in our Muslim residents in Italy analysis. As the oldest, most religious generations pass on and Generation Z and its successors make up a growing share of adults, the national affiliation figure is set to keep falling for decades, barring a genuine religious revival among the young. On that arithmetic, the sharpest phase of Spain's secularisation still lies ahead rather than behind.

This generational lens also helps explain why the national figures have proved so resistant to short-term swings. Because affiliation is anchored by large, devout older generations who change little, the headline number falls only gradually, masking the much faster shift underway among the young. The same cohort logic shapes Catholic identity across historically Catholic Europe, a comparison we set out in our Catholic population in Germany analysis. For Spain, the practical consequence is that the steepest part of the decline still lies ahead, as the gap between a secular Generation Z and a Catholic Silent Generation works its way through the population. What looks today like a slow national drift is, generationally, a much sharper break. It is the difference between a gentle national slope and something closer to a cliff edge running between the generations, hidden inside the averages.

Mass Attendance by Age, and the Key Numbers

Religious practice tracks the same steep age gradient. About 70% of Spaniards aged 18 to 24 never attend Mass, against roughly 24% of those aged 65 and over, with the share of non-attenders falling smoothly across the age bands in between. So even among young people who keep a nominal Catholic label, regular churchgoing has all but vanished, while older Spaniards remain far more likely to attend. This collapse of youth practice is the same hollowing-out of weekly worship we document in our weekly church attendance in Italy analysis across Catholic southern Europe. Pulling the threads together, Spain in 2026 has a religious population that is overwhelmingly older, more female and more nominal than active, with affiliation, practice and belief all falling steeply as you move down the age scale toward a broadly secular young generation. Almost every indicator examined here points the same way once it is broken down by age rather than read as a single national figure.

Taken together, the age data is the clearest possible signpost to where Spanish religion is heading. A country that is still narrowly majority-affiliated overall is, generationally, already a secular one, held above the line only by its oldest citizens. As those cohorts pass on, the national figures will follow the young downward, the same demographic logic that drives population change worldwide in our world population analysis. For the Church, policymakers and researchers, the lesson is to watch the youngest age bands and each new generation as the leading indicator, rather than the slower-moving national headline. On current trends, the affiliated and the non-religious will be evenly matched within a generation, and a secular majority is no longer a distant prospect but a near-term arithmetic certainty unless the young change course. The youngest age bands, in that sense, are less a footnote to the story than a forecast of it, and they are pointing steadily downhill.

Frequently Asked Questions: Religion by Age in Spain