I've had that for a long time, I think it's genetically the way my hairline is as my mom and her mom (my grandmother) also have that thin hair density at the center of their hairlines.I think whats more concerning is the miniaturization occurring at the center of your hairline. Hair still looks great, but I would get on finasteride asap. Hairline recession at the center of the hairline is brutal.
Also I saw a derm today and told him I've noticed some shedding and slight recession, he said there's no hair loss but if I'm worried he'll prescribe me Ketoconazole since it'll also help with a small dandruff/flaking issue I have been having. What do you guys think?