Men in my family have a reputation for going gray early, so at holidays and families reunions, you'll commonly hear: "I don't care what color it is, as long as it isn't falling out!"

But we're only half joking. The truth is, we're all just a little afraid that our egos couldn't stand up to a thinning head of hair.

We're not alone. In fact, hair loss is a very common problem, and it can often have a negative impact on a person's self confidence. So why does it happen?

Most often, people see their hair gradually thinning as they age. This is normal, and happens not just on the head, but on all parts of the body. Genetics are one possible cause, but exposure to chemicals, or poisons -- even some medical treatments -- can also affect hair loss. Those with an unhealthy diet, or sedentary lifestyle are also more at risk of losing their hair than more people who eat healthy and get more exercise.

But at the end of the day -- whatever the cause -- it's important to remember that it's just hair, and it happens to almost everyone eventually. Just take it as a sign that you're looking more dignified with age.