Here's labour statistics for employment over the last 20 years[1] - I don't know if the changes are marked enough to support your theory, but I thought I'd give you some evidence to work with.
It's possible I'm not looking far enough back either - the cultural shifts that lead to this would have probably been at the point during these now senior citizens mid careers, not late - you don't usually get into a new industry when you're 55.
https://www.bls.gov/charts/employment-situation/employment-l...
It's possible I'm not looking far enough back either - the cultural shifts that lead to this would have probably been at the point during these now senior citizens mid careers, not late - you don't usually get into a new industry when you're 55.