How do you? You don't

You grow up, settle down get your own place and do as you please under your roof, if you like snakes now you will still do in 5, 10, 15 or 20 years from now.

I wanted a snake as a teenager, never got one (same reasons), grew up, moved out, moved around the world (not something you can do with a snake) finally settled down years later bought my first snake in my 30's and I now have two room full.

Bottom line his roof, HIS RULES.