Male Pattern baldness is a hair loss problem that affects 95% of men. It usually depends on genetics and if necessary actions are not performed, it may lead to irreversible baldness.
Male pattern baldness is also called Androgenetic Alopecia (AGA). Once you start showing symptoms of the pattern baldness, it takes about 20-25 years to go completely bald. But cases were also seen where some of the men did go bald as early as five years after getting the initial male pattern baldness signs.