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?
Whoever makes it, tells it not. Whoever takes it, knows it not. Whoever knows it, wants it not. What am I?
Use me to reward good behavior.
I am black of eye and bright of hair. I fast into the ground and follow my lord as he races around the world. What am I?
If a man carries my burden they will get crushed to death. Though not rich I leave silver in my track.
The answer I give is yes, but what I mean is no. What was the question?