Answer:
When young, I am sweet in the sun. When middle-aged, I make you gay. When old, I am valued more than ever. What am I?
I am heavy forward, but backward I'm not. What am I?
I fill a room but take no space. What am I?
I am an instrument capable of making numerous sound but cannot be touched or seen.
I carry you down a gentle stream.
What did the piece of wood say when he saw the screwdriver and screws approaching?