I feel old...
I have a friend who's a 59 year old game warden. He insists that nobody over 50 should be using iron sights.

If it were up to me (I'm 69) every one of my regular shooters would have optics of some sort. But here's the thing:
Our club puts on a monthly "Military Shoot" and it's your milsurp with factory sights only ("snipers" shoot separately) and
my 'go-to' is an M-14 c/w std aperture sight. I used to qualify "Expert Rifleman" (299/300) with these sights (when I was
20!) but now looking thru the peep makes my front sight look all blurry. I just had a thorough eye exam--no cataracts (yet)
and I expect he'll write me a new Rx. I'll find out next week.
The other thing is that I underwent corneal laser Tx about 12 years ago. It worked great (I used to be "legally blind" without
glasses) and I went to 20-20 overnight. My acuity has deteriorated since then, but not by very much.
I now have 'transitions' for reading with a
slight correction for distance.
I can see the target at 100 yds, and the front sight clearly, with my naked eyes.
The only time I have trouble now is when I try to sight thru the aperture and my sight picture is totally whacky-jacky.
IDK if enlarging the size of the aperture would help; some say to decrease it...?
I do use my glasses to shoot, but I end up bobbing my head like a pigeon to find the sweet spot in the transition lenses.
The doc seemed to know a lot about sights and shooting, so I'm keen to know what he comes up with.