u/GloomyReplacement338

So about 6 months ago till now I’ve noticed my temples going back. Only thing is a bit before it started I lost 45 pounds in the span of a month and a half maybe 2 months? I am 18M, and the rest of my hair is still full and dark, including crown and the back of my head. I was wondering if this is balding, or maybe temporary from weight loss, or even “mature hairline” that won’t move for years?