I see so much drama regarding old age and seeing the front sight, histrionics regarding adopting dot optics, or astigmatism and dot optics. Spend time dry firing and your consistent acquisition of your dot will come around in no time. A big plus is that you will also pickup those iron sights with the same draw and presentation. Age and iron sights are not an issue. I use the distance area of my glasses when using irons… exactly like with the dot. The only real difference is that the front iron sight is blurry, whereas the green reticle and target are clearly in focus.
Do try shooting the irons in low light though, and make sure you can shoot them as well under challenging lighting conditions. Out-of-focus sights are a lot harder to see when dimly lit than when brightly lit.
I had an epiphany recently when I shot an IDPA-style night match at an indoor range, shooting my EDC from concealment. For background, I am 53, wear glasses, my corrected vision is 20/15 in one eye and 20/20 in the other, and I was shooting a 3913LS with tritium Novaks that are still usable but getting dim.
We shot the course once with the lights on (I did fine, all A-zone hits except for maybe one B), then again with the lights off except for some police strobes at one end of the range, and a personal light to illuminate the targets (I used my EDC Streamlight with a Harries hold, though some of the competitors actually had weapon-mounted lights).
In the low-light iteration, I still had A-zone hits on the close targets and even hit most of the bowling pins at 15-20 yards (it’s easy to see even a fuzzy, dimly-lit iron sight against white plastic), but there was one target at 10-15 yards shooting from a pitch dark corridor where my 53-year-old eyes absolutely could not pick up my black iron sights against the cardboard IDPA target illuminated only by my handheld light, even though I could see the target fine. Much to my chagrin, I had
zero hits in the vital zones of that target even though I could hit a bowling pin from further away under the same conditions. (My shots were on the cardboard, but near the edges and one was actually in the nonscoring margin.)
That got me experimenting more after the match, and it dawned on me that there is a huge difference between how aging eyes see iron sights on a brightly-lit range, vs. how they see iron sights under less-than-ideal lighting. I could see the target plenty well enough to shoot, but not my sights well enough to aim if there was no ambient light on the sights or the target didn’t offer much contrast. I could not directly illuminate my sights with the handheld light without the backsplash off the gun obscuring the target. And I couldn’t see the sights silhouetted against the target because I couldn’t focus close enough with my distance prescription to make the sights out in light that dim against a non-contrasting target, even though the target itself was clear and in focus.
That realization finally pushed me toward the red-dot train, so I’m shopping for an optics-ready EDC now (probably a 365XL, but we’ll see).