Does the thinning of donor hair in DUPA occur at the same speed and time as the hair in crown top and temples or later?

This needs an in-person evaluation. I suggest seeing a hair loss expert now to evaluate and go over your condition and provide you information about your best treatment options. There are great non-invasive options like prp/progesterone and/or hair transplantation. See an expert. Best, Dr. Emer

It doesn’t work in the same way with everyone as everyone’s hair growth and hair quality differs. You need to get it tested to get the exact report. I would suggest you to see a doctor in such a condition.

The speed and pattern of Diffuse unpatterned hair loss (DUPA) is absolutely different. Men can start thinning in the frontal and mid scalp at 18-22 only to realize the donor is thinning throughout the 20s. This is among the many reasons why a hair transplant is not usually a good idea in the teens and early 20s.