i would guess 8 years, because the way they act and fight
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They were called Ewoks.
They had little people put into costumes.
They're Ewoks.
I believe you mean the "ewoks" and they first showed up in Star Wars VI:Return of the Jedi.
If you mean the little furry guys in "Return of the Jedi," those are not Wookiees. Those are Ewoks.