I'd be more concerned about those who make sweeping judgments about other people they've never met...
My mother-in-law knows her limitations when it comes to driving. She never drives after dark any more, and only makes relatively short trips that are well within her physical capabilities...
You can't put an age cut-off on it - it's different from one person to the next. But I do think everyone, of all ages, should be re-tested and have to renew their licence on a regular basis.
My mother-in-law is 90, has all her marbles, and is probably a better driver than you. On the other...