I was approx 10 when I started keeping reptiles( I have had amphibians and Arachnids longer)... I now educate people on them. There's nothing childish about keeping reptiles... Maybe, aside from the fact that having them is enjoying nature in all it's glory(something regular pet owners; aside from specialized fish keepers) have completely forgotten about.
I don't hear many people get as excited talking about their cat or dog as I do between reptile keepers talking about their pets. They probably wish they had something they could be as enthusiastic about. reptile keepeing isn't childish unless your irresponsible.![]()