In men, hair that grows near the temple region, front, vertex (top) and crown
(back top of head where it starts to go in a 90 degree angle toward the
neck) are most susceptible to DHT. Hair on the back and sides of the head
(above the ear but below te top, are the LEAST susceptible to hair loss.
Male pattern hair loss usually begins in the temple region or the crown.
From there, the hair on top of the head starts to thin out and the two bald
regions can meet.

Hormone Causing Hair Loss
Hormonal changes are a common cause of female hair loss and female
thinning hair. Many women do not realize that hair loss can occur after
pregnancy or following discontinuation of birth control pills. It is important to
remember that the hair loss may be delayed by three months following the
hormonal change and another three months will be required for new
growth to be fully achieved.

Minoxidil for Frontal Hair Loss