Answer:
Alone I am 24th with a friend I am 20. Another friend and I am unclean.
I don't live within a house, nor do I live without. Most will use me when they come in, and again when they go out. What am I?
When young I am sweet in the sun. When middle-aged I make you gay. When old I am valued more than ever.
I have thirteen hearts but no body or soul. What am I?
I can go through glass without breaking it.
A man goes out in heavy rain with nothing to protect him from it. His hair doesn't get wet. How does he do that?