Answer:
What is always coming but never arrives?
Lighter than what I am made of. More of me is hidden than seen. What am I?
There was a girl half my age when I was 12, now I am 66, how old is she?
I can fall off a building and live, but in water I will die. What am I?
My first is a heir; My second's a snare; my whole is the offspring of fancy; which I sent out of play upon Valentine's day As a token of love to my Nancy.
No matter how little or how much you use me, you change me every month.