My understanding is that the studies are still pending on whether or not growth hormone supplement or testosterone therapy is beneficial is still in the clinical trials stage. Of course, a lot of the alternative medicine gurus would have you believe otherwise, but that's why they're alternative. I certainly wouldn't choose to base my career on giving growth hormone or testosterone in my office at this point. There is a field of "anti-aging" out there, it mainly consists of alternative practioners, gerontologists, dermatologists, and plastic surgeons; I had not heard that a lot of endocrinologists had entered this field as the research behind using endocrine therapies isn't there yet. Even if it was eventually proven that everybody looks/acts younger with hormone supplementation, if taking some pill or getting some shot is truly proven to be "anti-aging", then I suspect that it would fall more under the realm of primary care docs as everyone would be getting it as opposed to endocrine specialists. I suspect that there will probably be an anti-aging agent that will be uncovered, it will probably be discovered by endocrinologists, but I doubt that it will have much of an impact on practicing endocrinologists.