As a not quite middle aged dude, I only just now figured out how to see magic eye stuff. I tried a couple times in elementary school but didn’t get it so I stopped. Had a few drinks earlier, stumbled on some magic eye pic that I could see clear as day and it blew my mind a little
I finally realized how to reliably do it in my early 20s (a while ago now) but still can to this day. Just have to start with it at my face haha.