It was possibly the discovery of a lifetime: a drug that would reverse the effects of aging, seemingly indefinitely. The tests were all positive, first on rats, then monkeys and other large animals, and finally, on humans. It was a dream come true, the promise of a healthy, happy life, with all the benefits of the young, including energy, vitality, and sex drive, for 200+years or more. Tens of millions clamored to be among the first to take the drug.