Many younger men assume they have male pattern baldness as soon as their hair starts to recede. They might have, but it’s also likely that their hair is transitioning from the juvenile hairline to the mature hairline. This is an experience shared by most men, and usually occurs between the ages of 17 and 29.
Some men never lose their juvenile hairline; Ronald Regan and Bill Clinton are good examples of this. They may have experienced a slight recession, but it’s too small to be noticed. In fact, US presidents tend to have very good heads of hair but that’s beside the point.
In the majority of men, as many as 90 percent, we can recognise a mature hairline. It’s considered very normal, and a younger man wanting hair surgery will often be advised that his hair is simply making the transition from juvenile to mature. Hair transplants can be used to “repair” mature hairlines, however.
You can identify the position of your juvenile hairline by simple wrinkling your forehead, the position of the highest wrinkle will have been the position of your juvenile hairline. In terms of actual figures, the average forehead size for a man, i.e. from hairline to eyebrow, is between 6 to 8 centimetres.
However, men’s hairlines can vary sizeably depending on the person. Some develop a widow’s peak, some develop a regular shaped hair line and some men’s hairlines are very irregular, i.e. not symmetrical.