Do you know of any data source that stratisfies this by age group over a decently long period of time (say last 5 decades)? I would expect this number to take a

Do you know of any data source that stratisfies this by age group over a decently long period of time (say last 5 decades)? I would expect this number to take a nose dive as the ratio of retirees to works shifts towards retirees so i am not sure what conclusions i can draw from the data without some correction for retiree ratio.