I chose AO as a birthday present for my mum when I was 3. She couldn't play it(too hard) and here I am today
I used to get scared by sligs when I first played it(I could never get past them) and gave up. 4-ish years later I was looking through my dads games(DN3D, QuakeII, Magic carpet 2 etc.) and I found the disk. I have basically memorized every area(excluding secrets), but don't ask me to name them from a screen number.
AE was when I was 10. I borrowed it for 2 years(finished 3 times, all bad ending)