i have 2 older twin brothers, at 26 one of them started taking Finasteride while the other didn't. Now they are both 30, the one who took Fin has a full head of hair and looks around 22 while the one who didn't is literally bald NW6 and looks like our father.

This scared me so much that I started taking Fin at 25 and I also have a full head of hair at 28. Is hairloss common in your country?