If your hair seems to have changed right along with the rest of you after 50, you are not imagining things. Hair that was once thick may suddenly feel finer. Straight hair can develop a wave, curls may become harder to control, and strands that behaved beautifully for decades can become dry, coarse, or frustratingly flat. Then there is gray hair, which sometimes seems to have an entirely different personality from the hair it replaced. The good news is that having great hair after 50 is absolutely possible. The trick is to stop treating your hair exactly the way you did at 30. Hormonal c...