Answer:
When young, I am sweet in the sun. When middle-aged, I make you gay. When old, I am valued more than ever.
It is the time in your life when you simultaneously know everything and nothing at an instance.
What has two legs but cannot walk?
If you drop a yellow hat in the Red Sea what does it become?
When is it bad luck to see a black cat?
What is always coming but never arrives?
Funny
Animal
Difficult
Easy
Food
Kids
Logic
What am I?