The specific factors that determine how hair-free someone's head will be are still somewhat mysterious. World globe An icon of the world globe, indicating different international options. The conventional wisdom has been that men could simply take a look at the heads on their mom's side of the family and get a pretty good indication of how theirs might wind up looking. When a hair falls out and isn't replaced — or gets replaced with a much thinner hair — then we start to go bald. One German study suggested that balding before the age of 40 may be dictated by a gene on the X-chromosome, meaning that the predisposition would come from a mother's side of the family. Scientists believe the condition is mostly genetic, and caused by changes in our sex hormones. But scientists still aren't quite sure how it works.
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