Age, Light, Stars

A few days ago I bought a calendar at Barnes & Noble that has the night sky as it appears at 9 p.m. every night. The stars glow in the dark and the calendar has a compass on it. You're supposed to take the calendar outside and find the glowing stars on the calendar and match them up with the real thing.
The daylight hours are lengthening just enough to notice now. I feel inspired and energized at just the thought of more light. And in other good news, in 10 days I will be 36. Very, very old to some, and very young to others. Is gray hair what defines old? Are experience and wisdom what define old? Are wrinkles and incapacitation what define old? Is having children or grandchildren what defines old? Is anything not young, old? Compared to the stars, I will never be old.