Wow, MH, that post was really fascinating to me. I was born early 80's, myself. I see so many girls in college and high school who seem as old or older than me. Whereas I literally look like I am still in high school even though I am mid-20's. It is not just because I am petite, I have a youthful face as well. As far as I can tell, my body is quite young. I didn't get my period until I was almost 13, certainly not as late as females in the past centuries, but certainly not as early as many get it now. I have been interested in health for almost half my life, perhaps that has contributed. Anyway, what you say rings true. Perplexing idea.