A riddle...?!

Question: What goes up, doesn't come down, has 3 letters in it's name and begins with an 'A', and isn't 'air'?

Answers: What goes up, doesn't come down, has 3 letters in it's name and begins with an 'A', and isn't 'air'?

That would be

(cue fanfare)

your AGE

all? hmm, man i have been trying to figure this out, and you sure do have me.

AGE increases by the years and would never go down.

eh.....

i wonder...

AGE?????????????

Age?

Age!