Let's not confuse testicles with the sack holding them (scrotum). Hair does not grow on your testicles. They are internal; even if they were hairy, you'd never know it. Your scrotum (the bag that holds your testicles), on the other hand, grows hair once you begin puberty.
Puberty arrives at different ages for differ people. Regardless, 12 is well within the normal range for having a hairy scrotum.
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