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 at the end of a rainbow?
I am what no man ever yet did see, which never was, but always is to be. What am I?
You can see me in water, but I never get wet. What am I?
I am constantly overlooked by everyone but everyone has me.
Give it food and it will live, give it water and it will die.