Hasn’t finastride/propecia got some really bad reviews especially in the US over some serious side effects like impotence and loss of libido aswell as others that can’t be reversed? I would never risk things like that for the possibility of having more hair for a few extra yearsFor best results you're right it does need to be taken as early as possible. I've already started taking finasteride at the age of 27 before I get any hair loss.