There was something mentioned about this in a different thread the other day. I have noticed that my hairline has started growing about an extra cm in front of what hair I have always had. An easy way to explain this away would be hair loss being reverted by HRT, but I have never "lost" any hair (and I'm only 21). It's almost like new hair is growing where there never was hair before, and I can tell that it was triggered by hormones because it is much shorter than the rest of my hair, like it is first starting to come in. It is starting slowly - some strands are longer than others, but it is indeed filling in and bringing my hairline forward.