RAIN! Well, actually, rain does go back up, when it evaporates.
Gravity would have to be the answer.
The years never go down addition your age and the time
rain
your age
Age
Age, the New Year, and space go up but never come down.
The years never go down addition your age and the time
age
Vomit
age
rain
your age
your age
your age
your age
A waterfall
Age
Age.