What the pluck? As if your 40s weren’t maddening enough, your hair starts having its own midlife crisis — graying, thinning and popping up in the oddest places. “It is completely normal as a male or female to notice hair growth in places you would not expect as we age into our 40s and 50s,” Dr. Brett Bolton , founder of Great Hair Transplants , told The Post. “The most likely factor for this change of hair growth is hormonal, plain and simple.” If you’re facing this chaos, chin up. Bolton