Technically, yes. In most places 18 is legal adult.
But in general, depends on maturity. There are kids that had to grow up quick. There are adults who can't hold responsibility.
Bounce, you've got that nasty bounce, don't make my kitty pounce, ooooh bounce little kitty, bounce little kitty, Bounce, you've got that nasty bounce, don't make my kitty pounce, OOH, bounce little kitty, bounce little kitty