As of January 1, 2024, France has 68.4 million inhabitants, of which those over 75 represent 10.4% of the population. Behind this ratio lies a more nuanced demographic question: how many French people actually reach the age of 80, and especially, what mechanisms explain the recent acceleration in the number of very elderly individuals?
Cohort effect versus life expectancy gains: what really drives those aged 80 and over
We often observe a frequent confusion in public analyses. The increase in the number of people aged 80 and over is attributed to the extension of life expectancy. The demographic reality is more nuanced.
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Gains in life expectancy at birth have significantly slowed since the end of the 2010s, with marked fluctuations related to Covid-19. The growth in the number of very elderly individuals today primarily relies on a cohort effect: the large baby boom generations (born after 1945) are now entering the 75-84 age group.
Projections from the High Commission for Planning illustrate the scale of the phenomenon: the number of French people aged 75 to 84 will rise from 4.1 million in 2020 to 6.1 million in 2030, an increase of 50%. In the following decade, those over 85 will experience a growth of over 50%. Knowing what percentage of French people live to 80 requires distinguishing this demographic volume effect from actual health advancements.
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In other words, even if life expectancy stagnated, the absolute number of people reaching 80 would continue to rise for two decades, driven by the exceptional size of the cohorts born between 1945 and 1970.
Probability of reaching 80 according to generations: INED projections
Mortality tables by generation provide a more nuanced reading than simple cross-sectional statistics. According to INED’s work, the probability of reaching 80 has significantly increased for generations born after 1970. The sustained decline in cardiovascular mortality since the 1990s is the main driver of this gain.
For generations born around 2000, INED demographers estimate that a clear majority could celebrate at least their 80th birthday if recent trends continue. This observation far exceeds the common statement that “more than half of baby boomers reach 80.”
Three factors structure this progression:
- The massive reduction in cardiovascular mortality after age 60, which has redistributed causes of death towards slower-progressing conditions (cancers, neurodegenerative diseases)
- The improvement in living and nutritional conditions for cohorts born in the 1960s-1980s, who benefit from better health capital as they enter old age
- The decline in premature mortality (before age 65), particularly among men, which reduces the historical gap between sexes regarding longevity
However, we note that these projections are based on an assumption of the continuation of past trends. A major health event or a deterioration in living conditions could alter this trajectory.
Age structure in France: those aged 80 and over in the demographic picture
As of January 1, 2024, the share of those over 60 represents 27.7% of the population, compared to 19.6% in 1994. Those over 75 account for 10.4%, an increase of 1.6 points since 2010. According to INSEE estimates, the share of those over 75 is expected to reach 16.4% by 2050.
The share of those aged 65 and over has increased by 5.3 points since 2004, while the share of those over 75 has risen by 2.6 points over the same period. Conversely, the proportion of those under 20 has decreased by 2.1 points. By the end of 2024, individuals aged 65 and over will represent 21.8% of the population, compared to 16.3% in 2005.
Dependency ratio and European comparison
The dependency ratio (the ratio of the population aged 65 and over to the working-age population) is projected to rise sharply until 2050. France remains in a less marked situation than some European neighbors, but the shift is underway.
The share of those over 60 is now 4.4 points higher than that of those under 20. This crossing of curves, which occurred in the early 2010s, is a structural marker of aging from the top down.
Gender gap at the threshold of 80
Life expectancy at 65 is increasing for both sexes, but the historical gap between men and women is narrowing. Women maintain a significant advantage in terms of longevity, which explains their overrepresentation in the population aged 80 and over.
The reduction of the gap primarily comes from the decline in male excess mortality related to smoking and risky behaviors, a phenomenon well documented by analyses from DREES and INSEE. Generations of men born after 1950 show a significantly improved mortality profile compared to their predecessors.
For women, the situation is more complicated: the increase in tobacco-related cancers among female generations born after 1945 could hinder future gains in life expectancy. We are already observing a slowdown in progress for women aged 65 to 80.
Declining birth rate and pressure on the age pyramid
Aging is not only explained by the top of the pyramid. The continuous decline in birth rates since the mid-2010s exacerbates the imbalance. Fewer births mean a narrower base of the pyramid, which mechanically amplifies the relative weight of those over 80 in the total population.
The two dynamics, increased longevity and declining birth rates, mutually reinforce each other. The High Commission for Planning speaks of “large-scale, inevitable” consequences and advocates for a demographic vitality policy to mitigate the shock.
France finds itself in a demographic window where the proportion of people reaching 80 will mechanically increase for at least two decades, regardless of any changes in life expectancy. Decisions regarding public finances, care for loss of autonomy, and pensions will need to incorporate this arithmetic certainty.