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Some people sign "100 year."
What I use and most of my colleagues is a "C" handshape that is moved in a quick small circle (clockwise to you, counterclockwise to your observers).
Note: This sign is usually only recognized in context and it is helpful to use a bit of lip movement.  I showed it to several of my deaf friends in isolation and they had no clue what it meant.  As soon as I put it into a sentence most of them recognized it.

Animated version: (Autoload: About 1MB). 

A variation of the sign century is to instead of circling it you can shake it side to side a couple inches.

American Sign Language University ASL resources by Dr. William Vicars
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