What goes up but never comes down?

What goes up but never comes down? Answer it below pls do not cheat if not it will beat the purpose of this question! haha

Age? I don't know it for certain but it seems like age never comes down lol.

My never ending suffering in the eternal abyss. Jk probably a person with erection problems

I don't relive that age every come down. That might be right but I am not sure.