You are right, but I know guys with receded hairline with thick for many years
@That Guy I agree with you about mature hairline doesn't exist it's true 100%...but some guys are just "programmed" to lose some hairs in the hairline in an young age and keep most the hair in old age
I don't trust to much about Norwood scale...but for example a young with 20 years old with NW2 can be a NW3 with 50 years old.
For me, it's male pattern baldness but very slow....so don't make any sense take finasteride or minoxidil or others treatments.
But, you don't know if your hair stay same or worse...so I recommend take pics every 3 or 6 months to see if your hair stay same stage or worse...if this get worse YOU KNOW WHAT TO DO!