People who have 100 or more moles on their body may age more slowly than people with less than 25 moles. That finding comes out of London where scientists linked incidence of moles to telomere length. Telomeres are bundles of DNA in cells. Compared to "the plastic tip on shoelaces," telomeres help to prevent wear and tear of chromosomes. By measuring telomeres, researchers found that those with moles had a biological age 6-7 years younger than their non-moley peers.

The flip side is that a high incidence of moles also increases a person's risk for dangerous melanoma. But even though they don't understand why some people have more moles than others, researchers think that this may mean that certain people have some natural protection against age-related diseases like heart disease and osteoporosis.