This is such a useful comment, especially about ages. I would bet a higher percentage of people under 21 today are still in school, vs 100 years ago. School is

This is such a useful comment, especially about ages. I would bet a higher percentage of people under 21 today are still in school, vs 100 years ago. School is not leisure time, but comes with leisure time. And on the old end, Social Security and Medicare are probably allowing a higher percentage of people over 65 to enjoy a full retirement, vs 100 years ago.