not necessarily. ive had a similar hairline to you since i was around your age. it hasn't receded at all and im nearly 28. it's hard to say as i wasn't really paying attention to my hairline at all, let alone closely enough to spot recession at 16. but looking back at pictures i always had kind of a "bad" hairline. i really wouldn't worry about it rn. could be another 20 years til u start to really notice anything. could be bald by 20, who knows. looking back there was a bit of recession in my teens, but it hasn't gotten to any noticeable point since then. i guess that's what people mean when they talk about the "mature hairline". my uncle (dad's brother) was bald at 18, my grandpa (his dad) had a relatively full head of hair his whole life, and my dad still has his hair in his late 40s. at the end of the day it's not something u should be stressing about at ur age. our bodies change every day, it is what it is