I know this is going to sound weird, but my hairloss really started only 1 or 2 weeks after I began obsessively taking pictures of my temples, crown, etc and becoming anxious over it. Back then I seriously panicked thinking I had MPB as a teen, leading me to this sub. In retrospect, it looked perfectly fine. It then suddenly became much thinner, and since then my hairline, primarily the temples, has been steadily receding and my hair turned thinner, like a self-fulfilling prophecy.
MPB is certainly genetic, but what factors (like stress) could trigger it to start occurring earlier?
Some men practice denial, and one day they look and there it is! Are you really balding? See a good doctor and find out.