Was Billy Bob Thornton Bald? Many men begin to lose their hair at a young age. Most men lose a large part of their hair before they reach the age of 40 and become bald. Although this situation affects the appearance badly, it also poses a psychological problem. Hair loss can be caused by some ailments such as alopecia in some cases. Although ringworm does not harm other parts of the body, it causes hair to fall out. Progressive alopecia causes men to become bald. There are some celebrities as well as normal people who experience such situations. Billy Bob Thornton, for example, lost more than 50 percent of his hair in the early 2000s and became bald. This artist’s healthy hair is one of the most common examples of celebrity hair transplants.