Hair follicles have their own natural rhythms. Hair goes through cycles of fast growth and shaft extension separated by times of rest and shedding. These cycles are known as anagen, catagen, telogen, and exogen. When in Anagen, hair begins to grow. This is the longest stage, and it can last up to five years for scalp hairs. However, a single hair can continue growing for seven year... https://innosurgicalcare.com/when-hair-loss-typically-starts-male-hair-loss/