With aging, the body is subject to more difficulties, such as elderly nail fungus. According to B. E. Elewski, of the Case Western University Department of Dermatology, just being over the age of 60 exposes a person to the risk of nail fungus. There are several reasons for this. The immune system of elderly persons, generally, is less hardy than younger people. Not only does this make elderly persons more prone to nail fungus, but it makes a recurrence of this condition more likely. The Mayo Clinic notes that elderly people often have other health problems, such as diabetes, compromised circulation, or other skin conditions that contribute to enhanced vulnerability. The nails of elderly persons also grow more slowly, which hinders the production of new skin cells to replace infected ones. Symptoms of nail fungus, on the finger or toenails, are thickened nails with discoloration as well as the crumbling nails, which appear and feel brittle or look ridged or misshapen.