I am 23 years of age and I am losing hair (mainly because of dandruff). I would like to know until what age does hair regrow naturally.
We generally say that the hair wreath around the sides and top of the head, a 2 1/2 inch high area that runs from ear to ear, is permanent. We see this in the men who are very bald; they really never become fully bald as this wreath of ‘donor’ hair stays for life. The rest of the hair on the head of a very bald man may or may not last the lifetime of the man, depending upon their genetics. In women with no genetic hair loss, the same applies and the hair loss remains for the life of the patient. The small wreath of hair that we say is permanent in men, may not be permanent in women. Therein lies one of the differences in women’s genetic hair loss as compared to men’s genetic hair loss. On many women and men, the overall population of the hair may be decreased with age (unfortunate medical term is senile alopecia), but that rarely impacts more than 30% of the hair in impacted areas. So, worse case, an answer to your question is that fully 70% of hair on the head will last a lifetime, if genetic factors do not force it into an early death.
My grandmother lived to 114 years of age, and her hair was long (2-3 feet) and still growing when she died. She had a full head of hair. My grandfather died at 102 years of age with a full “Ronald Reagan” type head of hair with a hair line like he had when he was 10. He had a hair cut about every 3 weeks, and died at work behind his desk, a few days after his last hair cut (something he enjoyed doing very much because he got out and about). It’s all in the genetics of what our parents and grand parents gave to us (life span for ourselves and for our hair).