>I don't have this problem with other art forms
Of course, the earliest surviving musical notations (Hurrian songs: https://www.youtube.com/watch?v=QpxN2VXPMLc) and pieces of visual art are already pretty sophisticated compared to what the actual (not surviving) earliest attempts must have been.

Anyway, I wouldn't derive any enjoyment from overwhelming supermajority of games from before 90s either.

>after a certain age you just won't get it
This, of course, would be tied to your expectations that are shaped by your prior experiences. If I knocked up some girl and made sure the kid didn't have access to phones or tablets or TVs and then introduced it to early 80s games on 8086 PC when the kid turned four, I'm sure the kid would have grand old time playing Pac-Man or Alley Cat or, indeed, Space Invaders. Conversely, if you raised such a kid on classics from this millenium, undoubtedly they would find contemporary mobile games incredibly unsophisticated also despite these being "modern" (and lose the appeal of Space Invaders).