Male Pattern Hair Loss
In Males, genetic hair loss is inherited from either parent and usually begins in the late teens or early twenties. It is characterized by a gradual thinning of hair at the temples and/or top of the scalp. This may eventually lead to total baldness on top of the scalp.
Norwood classified the male pattern of baldness based on 7 stages.
The prevalence of Norwood Stage 3 or greater pattern of hair loss increases with age :-
Typical Males Pattern Baldness progress
Age Percentages of Hair Loss
18 to 29 12% to 16%
40 to 49 45% to 60%
Above 70 80%