Uhm.But it's not your age or anything, just your play style. Older versions of D&D were useless for gear heads. There was nothing to tweak, so they didn't bother to play and found a hobby that suited them better, like tweaking car engines or building model airplanes. Now that D&D permits them to find some enjoyment in the game they stick around, but that doesn't mean they're playing the game for the same reasons you are.
Gamers (and people) aren't neat little boxes of binary preferences. Plenty of gearheads played older editions of D&D. I know, they were a lot of the people I gamed with in high school (and I'm probably one myself). They also played other games (including wargames)!
1e had a decent amount of tweakability: play a magic-user (or to a lesser extent, cleric).
2e had tons of tweaking options via the supplements & settings.
3e is the holy grail for that kind of activity in D&D, obviously.