First handgun i shot was an old nine shot .22LR revolver, maybe an H&R or something, not sure on that as it has been about 30 years. First i "owned"/was gifted by my dad was a AMT Lightning 22LR, basically a knockoff of the Ruger Mark 1 target pistol, 6.5" or 6.75" tapered barrel, stainless. I still have it (and the box & allen wrench) but need to have a factory weld in the lower evaluated by a smith for safety and need to replace firing pin. Dad let me try the revolver & compete in one shoot at the local cop range; shortly after the competition, he gave me the AMT. I think this happened when i was about 9 or 10.
My first centerfire handgun was a snubby Titan Tiger for which i traded my aging grandma an airhorn (easier trigger). I was 15, riding with a snubby in my car door pocket.