I agree with Agahi.
Although I see no thinning and I would trade for your hairline because i'm an NW3, it is only the person who knows something is going on up there with his his hairline. After years of looking at a thick hairline, you start to notice some slight thinning and then the first thing you do is ask for help but people will generally look at you like you are crazy.
It happened to me, innocently enough I was NW1, when some thinning started and I asked my mom and she said it's okay, nothing's happening. I believed her, then 2 years later I was a NW3. It creeped up on me out no where too. Literally in months I shed a ton of hair which ultimately left me at NW3. I've been NW3 since then, because of finasteride stopping it, but I regret listening to my mother when I knew myself that something was wrong. I'm stuck at NW3 now because it seems no drug will do anything to put me back at NW1-2.Only an hair transplant can give me back a thick NW2 hairline.