I’m 18 and I lost part of my frontal hairline. Am I too late to start taking Finasteride?
For an 18 year-old with early frontal hair loss, it is the right timing for the drug Finasteride. The drug works best in young men and may even reverse the hair loss provided that what you are seeing is not a maturing hairline. A maturing hairline will not be affected by Finasteride. Your doctor will tell you if this is a maturing hairline or not. See here for pictures of a mature hairline: https://baldingblog.com/2007/01/12/maturization-of-a-hairline-moving-from-juvenile-to-mature-with-photos/