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 couldn’t for most of my life, but then I just tried about two years ago and it clicked. I’ve been able to ever since. It’s a cognitive skill. Once you learn it, it’s like riding a bike. I hate to make it sound as exclusive as it is, because that’s what turned me off of it to begin with, but it really is true. Just figure it out and it’s like a code that you can decode at will.