If you feel like your hair used to be thicker or have a different texture, you’re likely not imagining it. Just like our skin and bodies, our hair goes through changes as we age, starting in our twenties.We asked Yael Halaas, M.D., a facial plastic surgeon who specializes in hair loss and is a member of the American Academy of Facial Plastic and Reconstructive Surgery, to explain what happens, as well as what we can do about it.