Basic scientists have tended to think that many of those interventions haven't been sufficiently studied. Intervening in the aging process is not a new concept. Scientists have been researching the idea since the 1930s, most notably in studying the effects of caloric restriction. Work with primates over the past 10 years suggests that caloric restriction has the potential to retard aging and extend life in humans as well. Part of the workup involves determining biological age, as opposed to chronological age.
Patients also undergo cognitive testing, agility testing and strength testing.
Replacement therapies for estrogen, testosterone and human growth hormone play a major role. Human growth hormone, produced in the pituitary gland, is responsible for a wide range of youthful attributes, such as increased muscle and bone mass, decreased body fat, strengthening of the immune system and a greater sense of well-being and energy. Testosterone can improve mood, alertness, libido, and skin and muscle tone in both men and women. For most people, hGH levels drop dramatically by age 30. Testosterone levels also decline.