Is female genetic hair loss/hair thinning more likely to start in early 20s if you’re of Asian (Korean) heritage? I’ve read that East Asian females have a greater chance of developing diffuse thinning than Caucasians.
No. I’m not aware of any good scientific studies that investigated women with hair loss by ethnic groups. We generally believe that hair loss does not discriminate race, sex, or ethnicity. In other words, it is mostly the same for all populations. You’re not at any greater risk than a Caucasian woman is if the genes are present.