If you take care of yourself you can carry a tight slided 1911, drive a 6 speed corvette and any darn thing you put you're mind to. We are all going to get older thats' a fact.
Shooting driving well and most other sporting things are all perishable skills, and as you get older, you really need to "show up" for life. If you want to maintain your skillset, you must exercise eat right and do strength building exercises. If not you will find that the bullet the car and everything else is not going in the right place.No reason you can't enjoy shooting sprts untill the day they put you in the ground, as long as everything is working right and you are mentally and physically correct.
Perhaps some folks over 90 should take a self awareness test just to see if they are doing as well as they believe they are. Privatelly of course, have a pro, or someone who you respect, access what they see in so far as your ability, Normally I would be against anthing like this, but you will get the occasional older gent who refuses to stop driving and the like, even after several accidents. It's other peoples lives that concern me.But for most intelligent men, they know when the time has come themselves. My uncles all stopped shooting a year or two before they passed on, still kept their guns for protection at home, but no more hunting and the like.Same with driving, just to the local store and back, no more road trips.