why is nobody fun when you grow up?

I am generally a pretty lazy person, but when I do get that itch to actually do something, I want to do something fun, not just go out to dinner all of the time. I can rarely convince anyone to be wild and crazy with me, and I don't mean clubbing until 3 in the morning. I want to go ice skating, or ride go carts, or go get a tattoo. People just want to do drinks. It's getting old, apparently like my friends and me.

Why can you not be a kid in your 20's? If you are, then you are considered not responsible, immature, and probably living in your parent's basement. Now, some of these people do fit the stereotype, but I am not those things, I would just like to be a kid every once in while. I want to go sled riding and then make a fort in my living room out of couch cushions and bed sheets. I believe it will make you live longer. Am I not allowed to be a kid anymore?