Well, I really hate to burst your bubble burst, but there are many jobs where mandatory retirement is legal. Certain "higher" stress jobs for instance - law enforcement, and airline pilots come to mind.
At least you quanified your statement with "in most cases".
I believe Dave and I both fall in the listed categories.
'73 280SEL 4.5 (9/72)- RIP
Only 8,173 units built from 5/71 thru 11/72
'02 CLK320 Cabriolet - wifey's mid-life crisis
2012 VW Jetta Sportwagon TDI...at least its a diesel
Non illegitemae carborundum.