My mom’s dad was mostly bald by 30, but my dad has absolutely no sign of baldness at 56 and his dad had a fair amount of hair left in his late 70’s.
I know your mother’s father is the best indicator for inheriting MPB, but what if there’s an extra Y chromosome involved (i.e. someone who is XYY)?
Since I inherited my dad’s hair twice (it also become brown and then later curly at the same point in life, 11 and 17 respectively), could I have dodged a bullet?
I’m closing in on 21 with no sign of baldness yet. Would the extra Y outweigh the MPB on the X chromosome?
Even if you were an XY, you have about a 50% chance of inheriting your father’s family line. I do know now about XYY like you are, but I would generally tell you to do what I always tell people to do when determining their likelihood of developing genetic balding: