Some older people do need to have their drivers license revoked. But I don't think it should be based on age.
I know a 90 year old man that is a great driver and I would trust riding with him over a new teenage driver.
He's an excellent driver and has good eyesight and coordination.
So no drivers licenses shouldn't be revoked just because you turn a certain age.
It should be based on the actual drivers ability to operate a motor vehicle.