I’m a Diffuse Norwood 6/7 at 21 Years Old

I started losing my hair when I was only 13 years old and now at 21, I’m a very diffused NW 6/7. My permanent zone is also not as thick what it was used to be. My father and grandfather both have good density in their permanent zone but they both started losing their hair after mid twenties.

Does permanent zone of young MPB sufferer thin out too?

You need to see a doctor and get a good diagnosis of your hair loss and its cause. You may have diffuse thinning (including your donor area) or you may just be a Norwood 6/7 with fine hair. I do not know this. Permanent zones do not undergo thinning with typical male pattern baldness.