Age is a common reason for hair loss.

The genes and hormones covered in the previous section are not enough to cause androgenetic hair loss instantly — this process takes time, during which any follicles susceptible become exposed to the problematic male hormones.

How much time does this demand?

Length varies from one person to another.

It depends on an individual’s genetic expression and the level of androgens found within their blood.

Patient A may start to show signs of hair loss far sooner than patient B, even though the eventual end result is probably expected to be the same.

Two-thirds of men will be affected by male pattern baldness by the time they turn 60.

However, even with no clear predisposition to androgenetic hair loss, hairs can change significantly as people age.

They may become shorter and thinner over time, in a process known as miniaturization.

Those affected will shed miniaturized hairs while the number of their follicular units decreases, leading to reduced hair coverage overall.