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Society will rather have to adapt to population ageing.
Population ageing corresponds to the increase in the proportion of the elderly in the population. It is influenced by four mechanisms:
On the one hand, we cannot reverse the baby boom of the thirty post-war years. On the other hand, putting in place policy measures that are specifically targeted to increase the number of deaths through a slower increase in life expectancy is inconceivable. This would be like wishing for a deterioration of living conditions, a drop in educational levels, worsening access to health care, etc.
In theory, pro-natalist policies can slow down population ageing by broadening the base of the age pyramid. However, numerous studies have shown that these policies make it possible for couples to achieve the desired number of children (almost two children in developed countries) rather than increase that number. In addition, the ageing problem would reach its peak in the following 20 years. Broadening the base of the pyramid by increasing the number of births and, gradually, the working age population, will require more time.
In a country with a positive net migration, immigration makes it possible to slow down population ageing through its dynamic on the working age population. It is, however, only a part of the solution for population ageing. The latter
is in fact explained mainly by the widening of the top of the age pyramid. Additionally, immigrants will also age in the longer term.
Implementing strictly demographic policies to counter population ageing in the coming years is far from being a panacea. By way of illustration, the evolution of the ratio between people of active age and those aged 67 and over
shows little sensitivity to different plausible demographic scenarios presented in the graph. As of today, society must adapt to the population ageing of the coming decennia.