My Grandfather and I had a related conversation one time before he passed... He was a truckdriver all of his life, and driving meant the world to him. We discussed how as one grows older, reaction time slows, vision blurs, and how many people were against seniors driving. Now, I think one might argue that either topic - license to drive or have a gun can be, ahem, "lively" on either side of the fence.
Anyway, I think we came away from the conversation with; As long as a person is deemed of sound mind, has a history of safety, can operate safely and continues to remain certified, there should be nobody against it. This seems to apply as well to guns as to driving. I wouldn't be against re-certifying every year (gun or driving!) if that was the rule by which we were all universally measured. I don't think it's any great burden as long as the rules don't change as I get older.
Can I shoot straight and pick out targets properly? Can I see said targets? Do I know what signs mean on the road? Do I drive like a crazed teen or overcautiously (which can be just as dangerous as too fast)? The AARP is wrong headed in this. It perpetuates the "someone will always be there for you" mindset that is so rampant these days.
And yes, I'm fully aware that teens and seniors tend to make up the bulk of accidents (for completely different reasons).
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Experience is a hard teacher because she gives the test first, the lesson afterwards.