It certainly is. Im 23 myself and have just started a routine of Ru and CB (just because i couldn't afford CB at all times). I couldn't bring myself to take finasteride, being quite a competitive bodybuilder and strength athlete i couldn't rationalise the affects of finasteride being anything i wanted to mess with.
However, i am keeping an eye on Polichem's development of P-3074, which is a topical finasteride which so far has 'supposedly' yielded 15 times less systemic exposure in trials, which is in the last stages of Phase III soon to be marketed which i would be more comfortable taking than the actual pill.