A possible factor (but not the only one) - older workers are more expensive to hire due to higher salary expectations and higher health costs. That would make t

A possible factor (but not the only one) - older workers are more expensive to hire due to higher salary expectations and higher health costs. That would make them unappealing to a whole swath of companies - the ones with limited hiring budgets, the ones with simple enough job requirements that a new-ish grad can do them for cheap etc etc. It would be interesting to see the data pertaining to salary+health costs based on age.