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 can't go left, I can't go right. I am forever stuck in a building over three stories high. What am I?
I can sizzle like bacon. I am made from an egg. I have plenty of backbone but lack a good leg. I peel layers like onions but still remain whole. I can be long like a flagpole yet fit in a hole.
I have two eyes in the front and a lot of eyes on my tail. What am I?
I am always in front of you, but you will never see me. What am I?
It flows out of the soil, It burns you if it boils, And holds us in its coils, More valuable than gold, As black as it is old.