I don't remember how long I was on HRT before I noticed these myself. My FFS surgery earlier this year put the new growth into hibernation (or shock, IDK) for a bit but now it's growing again and continues to improve. The real delight is that the new hairs are growing both in front of and some within the hairline surgical scar. I never expected this. Now if I could just see more growth at the outer corners of the receded area I'd be on cloud nine!