The idea that each generation would live longer than the previous one anchored in the collective imagination as an evidence of progress. Fucked by a century of medical and health triumphs, this belief has shaped the social expectations and public policies of developed countries. However, a discreet but deep turning point seems to take place. The dynamics of life expectancy no longer follows the ascending trajectory which has brought it so far.
These successes gave birth to a collective feeling that human life continues to lie down. Optimistic projections, based on past trends, even predicted that a 100 -year life expectancy would one day become the norm for new generations. This trajectory, however, seems to be inflated today.
When life expectancy encounters its physiological limits
A study published at the end of August 2025 in the Proceedings of the National Academy of Sciences deeply questions this linear vision of longevity. By mobilizing six different methods of demographic forecast, the researchers have analyzed the life trajectories of 23 industrialized countries, based on data from Human Mortality Database. The verdict is final. The generations born between 1939 and 2000 show a clear slowdown in the gains of life expectancy.
In the most pessimistic scenario, the gains drop by more than 50% compared to the previous period. Even in the most optimistic projections, no birth group after 1938 should reach, on average, the symbolic CAP of 100 years. This brake on progression cannot be explained by a defect of the models used. It is already observed in real data, especially in the youngest age groups.
The main explanation lies in the exhaustion of margins of progress on infant mortality. For several decades, death rates before the age of five have become so low that longevity gains can no longer be based on their improvement. However, advances in adults and the elderly, although important, are not enough to compensate for this initial loss of speed.
Change paradigm to extend our life trajectories
If the curves are flattened, it is also that the easy levers have already been activated. Living longer no longer depends only on effective medical care or a healthy lifestyle. It is now a question of repelling the boundaries of aging itself. For researcher José Andrade of the Max Planck Institute for Demographic Research, co -author of the study, the key to the next decades could reside in a better understanding of the biological mechanisms of aging, in order to target age -related pathologies from their emergence.
Other avenues may come from the increased prevention of chronic diseases, from the fight against social inequalities in health, or even medical innovations. However, the authors recall that even if survival at advanced age progressed twice as quickly as expected, this would not be enough to reproduce the rhythms of improvement observed in the last century.
The University of Wisconsin-Madison, also involved in this work, underlines the potential impact of these forecasts on public policies. Reform retirement systems, adapt care structures and review anticipation in terms of aging become priorities. On an individual scale, these data also invite to review long -term planning strategies, both in terms of savings and quality of life. It is no longer the number of years to come that you have to maximize, but their value.
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