Answer:
When young, I am sweet in the sun. When middle-aged, I make you gay. When old, I am valued more than ever.
A great mysterious place that the bold have been known to journey into.
What has a spot and is very bright, is sometimes, red, white, blue, yellow or green and is often blinding.
I can be written, I can be spoken, I can be exposed, I can be broken.
I move without wings, Between silken string, I leave as you find, My substance behind.
What did the piece of wood say when he saw the screwdriver and screws approaching?