Hi,
I'm Flagon_15 from Belgium and have joined this forum to discuss Lego with you. I'm 37, have two kids, but never "grew out" of Lego ; it was awkward twelve years ago, but now that I play it with my son (10) and daughter (7), it has become socially acceptable, which I'm very satisfied with
I used to have many different kits over the 30-year span of my addiction, but the ones I liked the most were the Star Wars ones from the 90s and early 2000s. Now, I mostly do medieval and Wild West settings (buildings, accessories, characters) with my kids, and Cold War-related themed things for myself - Checkpoint Charlie, T-54 tanks, F-104 planes, the Vostok space capsule, you name it.
As far as the size of my Lego collection goes, I don't know since most kits were broken up and the plans lost (a crime, I know... but I like it this way, it's more imaginative) but I've been counting it in kilograms for decades now.
And that's all for now, have a nice weekend!