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 an fill a room but takes up no space?
What kind of table has no legs?
We are all around, yet to us you are half blind. Sunlight makes us invisible, and difficult to find
Metal or bone I may be, many teeth I have and always bared. Yet my bite harms no one. And ladies delight in my touch.
People take me on walks and I run and have fun. What am I?