Likely someday you'll be that old, and the roles will be somewhat reversed, just remember that. lol
I think mandatory re-testing for anyone over say 55 or so is a good idea. Make them do a medical and/or road test every 2-3 after. If they don't like it? Tough, they just have to realize they're aging. My grandfather took it like a man, realized there was stuff he couldn't do anymore.
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