The Truth Behind Hair Loss In A Man... Hair loss in a man is somewhat different than hair loss in women.  In formal hair growth, approximately ninety percent of the hair on the scalp is in a continual state of growth.  The remaining ten percent of hair on the scalp is in a phase of “resting” which tends to last two of three months.  At the end of the resting phase, the resting hair is shed.   As you grow older, your hair growth slows. ...