Answer:
I start new then become old. Start clean but be one dirty. I usually start big then become little.
I am a protector. I sit on a bridge. One person can see right through me, while others wonder what I hide. What am I?
Two bodies have I, though both joined in one. The more I stand still the faster I run. What am I?
I can wake you up in the morning but I require no electricity or winding.
Only one color, but not one size. Stuck at the bottom, yet easily flies. Present in sun, but not in rain; doing no harm, and feeling no pain. What am I?
What is always coming but never arrives?