I am a 21 year old male that has noticed my hair appears to be thinning on the back and sides after I buzzed it. This was not visible whilst I had longer hair. Please see the attached image of my donor area under a microscope.
This is a difficult call. What I am seeing is a drop off of the hairs in each follicular unit and some complete follicular units that are miniaturized. A few have the advanced miniaturization that is associated with DUPA. I would keep an eye on it, meet with a doctor and go on finasteride and then reassess in a year or so.