Good news! Look after it dude - no heavy lifting etc, keep off the cigs if you can, and eat healthy.
I was cast 11 weeks, then soft brace as a precaution for another 8. Your hand will get seriously stiff and a bit nasty looking from being in the cast, but the movement (especially to the thumb) will come back quick, and the wrist shortly after.
You are never too old for cast art
.