Very good question.
I recieved my fist model at 11-ish yrs old.
I liked building it.
got another one.
I think it helped my focus and kept me out of Trouble.
With 2 other brothers helping dad work on 1:1 cars, there wasn't room for another.
So I built
then bought
bought some more.
A few more
built
bought
bought
Etc...
29yrs later, it is still the same thing I did as a kid.
It's my own little World, My reality, My escape.