Answer:
I am quick when I'm thin. I am slow when I'm fat. Wind is my worst nightmare. What am I?
Without me everyone would lose their head. What am I?
Although I am still, in families I run. I continue to live on in a living one. As one continues to draw breath, I will not rust. However, when one stops drawing breath, I will become mere dust. What am I?
Good memory, skin like the sea. A great beast I am, yet vermin frightens me. What am I?
I am a chair that can move. What am I?
No matter how little or how much you use me, you change me every month.