All men lose hair as they get older this may be a very small amount, it may not even be noticeable, for some men it can be the opposite where there baldness is very much noticeable, and can be very distressing when it starts to thin at a very young age.
If you have male pattern baldness, you are losing your hair because your body is becoming increasingly sensitive to male sex hormones called androgens. The extent to which your scalp is affected by this process is hereditary.
You can also lose your hair because of illness or surgical procedures, stressful circumstances, changes in hormone levels and scalp infections. But in many cases hair loss is not permanent