If everyone on this planet acted their age, we'd all be bored as hell.
Tru dat yo.
Read the news people, how old is that guy flying around the world by himself with no stops? It's either 60 or 80, I can't remember exactly right now. He tried to do it in a hot-air balloon 6 times and almost died 4 of them before his seventh attempt was successful... Dare to tell him to act his age? That would be a funny conversation:
Old Guy: I'm setting out to circle the globe by myself in a hot-air balloon.
Ignorant Dumbass: Aren't you like 80 Old Guy? Start acting your age..
Old Guy: Oh, I'm sorry, here, let me become senile and crap my pants in my nursing home... Is that better for you?