Male Pattern Baldness Androgenic alopecia or male pattern baldness is a typical pattern of hair loss in men, which is for the most part caused by a single dominant autosomal gene. Other factors include the male hormone androgen, age, and genetic predisposition. Each month the scalp hair grows at an average rate of half an inch. Every hair has an approximate lifetime of four to seven years, which after this it falls out and is replaced by a new hair. For the most part, 15% of hair is growing, while the 85% of the hair rest. This wide spread disease effects about 2/3 of the worlds male population at some point or another. Generally, hair loss begins to start