Edmund Chein Tales of explorers searching for a mythological 'Fountain of Youth' date all the way back to the 12th century. While nobody has successfully found the fabled cure for aging, many modern scientists are looking closer to home, developing expensive lotions, painful surgeries and other temporary solutions.

But one treatment developed in the past 20 years has made great strides at rewinding the biological clock: hormone replacement therapy, or HRT. Pioneered in the early 1990's by Dr. Edmund Chein of the Palm Springs Life Extension Institute, HRT can shave up to 20 years off a patient's physical age and actually extend their life. HRT is also a wellspring of internal benefits, like increased bone density, increased energy, loss of body fat, increased muscle mass, and the re-growth of body hair.