Answer:
Long and thin red within with a nail at the end.
Alone I am 24th with a friend I am 20. Another friend and I am unclean.
The more there is the less you see.
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 hands but cannot clap. What am I?
Give it food and it will live, give it water and it will die.