Answer:
What force and strength cannot get through. I, with a gentle touch, can do. Many in the street would stand. Were I not a friend at hand.
What comes once in a minute, twice in a moment, but never in a thousand years?
My first is equality; my second is inferiority; my whole is superiority.
Goes over all the hills and hollows. Bites hard, but never swallows.
Long legs, crooked thighs, little head, and no eyes.
You can always find me in the past. I am created in the present, but the future can not change me. What am I?