Answer:
I appear in the morning. But am always there. You can never see me. Though I am everywhere. By night I am gone, though I sometimes never was. Nothing can defeat me. But I am easily gone.
In many years, not much has happened. In many minutes, a lot has happened. In one second, everything has happened.
When young, I am sweet in the sun. When middle-aged, I make you gay. When old, I am valued more than ever.
Useful tool for who in darkness dwell. Within you, corrupting like a deadly spell.
Above all things have I been placed Thus have I, a man disgraced. I describe sunlight or lock But after all, I'm just a rock
I am the kind of an ant that's good at math. What am I?