Answer:
I am what bring things together. Without me everything you see would be a total mass or debris everywhere.
I help engines spin and pants stay up. What am I?
I get dirty when wiping things clean. What am I?
What has 4 fingers and a thumb but isn't alive?
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?
What never gets any wetter no matter how hard it rains?