Answer:
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?
I am an English word that is as long as I am valued.
My rings are not worth much, but they do tell my age. What am I?
I have feet on my head
I hold two people together but touch only one. What am I?
No matter how little or how much you use me, you change me every month.