When I was a young dude I could bring my fingertip right up to my eye, touching my lashes, and still focus on it. Not any more. No closer than maybe 8 inches. It was great for working on tiny things- I probably should have made my living fixing watches. I've never wanted bifocals--for many years, when I've wanted to see something close up, I just look over my glasses.
Now I seem to be getting cataracts- halos around lights and such, though my night vision is still good. That's what my dad was experiencing, and he just had cataract surgery a few months ago at 85. I don't think I'll be able go that far before needing it. I have my doubts whether I'll be going up on the roof when I'm his age either, and he has no problem doing it.