I do not want to be an old boy

Yesterday, my Ah Mah came into the bathroom while I was taking my bath. She picked up a few strand of hair and jokingly told me that it was mine. She did not want to admit that it was hers.

I immediately replied her "I do not want to waste my hair. Later I will be an old boy". She laughed and understood what I meant. I would not want my hair to fall off. I associate baldness to being old.