Although France began to become a "senior" society as early as 1865, it took 130 years for the percentage of the population that was considered "aged" to rise from 7 % to 14 %. In Sweden, this process took 85 years. In the US, it took 70 years, while in Britain and West Germany, it was 45.
法國雖由一八六五年就開始邁入老人國，但老人人口從百分之七增加至百分之十四，足足經過了一百三十年；瑞典則歷時八十五年；美國七十年；英國、西德也經過四十五年。