TLDR Some treatments like minoxidil, finasteride, and surgery can help with hereditary hair loss.
The document from April 2018 by Mohammed Sfai Aldeen Abdulla Seleem discussed hereditary hair loss (androgenetic alopecia), which is the most common form of hair loss in men, accounting for over 95% of all baldness cases. Hair growth, which averages 1.25 cm per month, slows with age and can decrease to 0.25 cm per month. Baldness becomes noticeable when about 50% of hair is lost. Hair loss is often due to an internal disorder as hair, a protein product of follicles, is sensitive to bodily changes. Male pattern baldness is linked to genetics and male sex hormones called androgens that regulate hair growth. Over time, the hair growth cycle weakens, the hair follicle shrinks, and hair becomes shorter and finer until no new hair grows. While there's no cure for hereditary hair loss, treatments like minoxidil, finasteride, and surgery may be beneficial for some individuals.
May 2020 in “International journal of molecular biology” Mutations in the AR gene cause hair thinning and loss.
31 citations,
April 2019 in “Journal of Cutaneous Pathology” Hair becomes gray and thin as we age, and while most hair loss in older people is due to genetics, there's a chance for gray hair to regain color under certain conditions.
Baldness is often hereditary and linked to male hormones, becoming noticeable when half the hair is lost.
6 citations,
June 2011 in “Pharmacognosy Journal” Many products for hair re-growth exist, but a perfect treatment without side effects has not yet been found.
4 citations,
January 2007 in “Indian Journal of Dermatology” Body hair can be used as an extra source of donor hair in hair restoration surgery for people with severe hair loss.
76 citations,
December 2006 in “Journal of Dermatological Science” Japanese women typically start experiencing hair loss after 40, with reduced hair density and thickness being the main factors.
19 citations,
January 1990 in “Springer eBooks” 
3 citations,
October 1982 in “Postgraduate Medicine” Most types of hair loss can regrow naturally, but there are no effective cures for male pattern or age-related hair loss, and only limited options for females.
