Generally people on here consider guys in their 20s to 30s with Norwood 3+ as having aggressive male pattern baldness. Someone who starts balding at 16 and by 30 is Norwood 3 is aggressive, and someone who startes balding at 30 and by 35 is Norwood 3 is aggressive. The same can be said for this in reverse. It all depends on age of onset and speed of progression.