Rain
I beg to differ. Rain may come down, but accdording to the water cycle, the "rain" becomes rundown water, and eventually evaporates, therefore, rain does go up.
The years never go down addition your age and the time
Age, the New Year, and space go up but never come down.
Well it is easy age never gos down money bills don't go down i mean how cant you get that? BUT ANYWAYS THAT'S THE RIGHT ANSWER
Vomit
age
age
rain
your age
your age
your age
your age
A waterfall