Interesting article, especially considering that IBM is currently in the spotlight for age discrimination.
American Workers Are Older Than Ever, And They're Sticking Around
https://www.tmj4.com/newsy/american-workers-are-older-than-ever-and-theyre-sticking-around
Somebody once posted that American firms want to hire young, motivated 22 year old millenials with 32 years of experience,
They are working longer because the retirement plans were taken away in the last decade or two.
What do you expect? Most people have not saved enough to retire by retirement age. You are going to see more and more people working past 65, well into their 70s.