You'll be like Peter Pan but sadder
Being an adult is hard. People expect a lot from you. Like, they expect you to put on real pants before leaving the house and they also expect you to eat something other than just gummy worms for lunch.
There are also things they don't expect from you when you're a grown-up. Like, they don't expect you to tie a Fuzzy Throw around your neck like a cape and "fly" from the middle of your staircase down onto a 2pc Pillow Set.
So if you ask me, being a kid is the way to go. Because then you can get away with screaming loudly and running in circles whenever the mood strikes. Do that as an adult, especially in an elevator, and someone is going to come take you away.