I have a macbook air build in dec 2008 im running os 10.6.8 but i cant upgrade to yosemite?

I cant upgrade to yosemite im running os 10.6.8

Are you sure your MacBook Air was built in December 2008?
Early 2008 MacBook Airs (model identifier MacBookAir1,1) can't run any OS newer than Lion (10.7):
http://www.everymac.com/systems/apple/macbook-air/specs/macbook-air-core-2-duo-1 .6-13-specs.html
Late 2008 MacBook Airs (model identifier MacBookAir2,1) are capable of running Yosemite:
http://www.everymac.com/systems/apple/macbook-air/specs/macbook-air-core-2-duo-1 .6-13-nvidia-late-2008-specs.html
From the Apple menu, select "About This Mac" and see what it tells you.  Your Mac may be too old to run Yosemite.

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