My first ever kit was the 1/72 Airfix FW-190 which I got for my 4th birthday, in 1971. My brothers had most of the first (and second) world war's aerial combat going on, pinned to their bedroom ceiling so I naturally also went for aircraft. I progressed to 1/32 aircraft when I was about 10 - and had covered my ceiling too. I remember I had the Harrier Jump Jet, F-18 Hornet, Mirage, SBD Dauntless, Spitfire and Hurricane to name just some. The occasional weekend was spent re-building and/or repairing the ones that crashed on night missions. :rolleyes Some of the dogfights that happened while I was asleep were fairly bad. One thing I did learn early on was never to cross the strings of one model with another, as you hung it from the ceiling, or it would cause a daisy-chain collapse of models if one of them pulled its pins out of the plaster. :facepalm
Then when I was about 14, I discovered Tamiya 1/35 armour and went for that in a really big way. Everything had to have a diorama and the shelves weren't big enough. Ended up with about 50 vehicles, some on the shelves and some carefully stashed in a spare couple of drawers.
All the aircraft (that survived) went to my best friend's younger brother when I was 19, and the armour got turned into target practice for my old Weirauch .22 carbine when I was about 25. Makes me cringe to think I did that now but by that time my life was all about work, pubs, clubs, friends and girlfriends and holidays. Ah well.