The maximum length of time hair spends in the anagen phase, otherwise known as the active growth phase, varies from person to person depending mainly on genetics. Yet, various things can disrupt the time our hair spends growing, like our health, diet, stress and hormones. For example, an increase of dihydrotestosterone (DHT) in our system during menopause leads to follicle miniaturization.
When this happens, our once-healthy follicles start producing thinner, weaker hair. DHT and other issues can disrupt the growth phase for some of our strands, cause fragile hair and even result in permanent hair loss. But there are ways to counteract this issue and increase our hair's time in the active phase.