Answer:
In Paris but not in France the thinnest of its siblings.
You use me from your head to your toes. The more I work, the thinner I grow. What am I?
I can be long or short. I can be grown or bought. I can be painted or left bare. My tip can be round or square. (one word)
Some try to hide, some try to cheat, but time will show we always will meet.
Born of sorrow, grows with age, you need a lot to be a sage. What is it?
The warmer I am the fresher I am.