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 is the smallest bridge in the world?
There are millions of me. I am very small but when moving fast I am deadly.
What word has kst in the middle, in the beginning, and at the end?
I work when I play and play when I work.
My days are numbered.