Do we grow up?

Yeah, I don't think we do either as long as you realize that you are only as old as you feel! I just turned 25 and went to Disnelyand for my birthday! Case and point

I think being adult means you have to be more responsible and take care of your life if you want it to thrive. ie. you would need to maintain a job to be able to pay bills, etc. And also, you can't get away with as much blaming it on being a child. For example, many children do not yet know something is wrong or inappropriate and are taught by the adults that (hopefully) raise them. But I don't think being adult means we have to let go of the childlike innocence and appreciation for the small things children possess. We can still indulge in and enjoy child like novelties just with the added responsibilities of adulthood.

Well I'm 26 and I still play some old video-games I used to play as a kid. I think only the way you live can make you feel old or not. :)

I don't think that "growing up" means we have to leave all the fun things we like to do behind. I consider a person to be grown up when they are willing/able to find a job, get a house and pay their own bills. Being grown up is taking care of all of your own responsibilities and not having someone else take care of you. But just being grown up doesn't mean you can't have fun or even still enjoy playing with toys. I think the grown ups who still want to play are just younger at heart, which is a good thing.