Every new class of rejuvenation therapy, and there will be many of them in the decades ahead, will follow a cycle consisting of a few years of rapidly growing hype, followed by a sharp crash of disappointment, and then, ultimately, long years of slow and steady success. People attach great hopes to the early stages of every new technology, unrealistic expectations for sweeping, immediate change and benefit. Those expectations are usually possible to realize in the long term, but they can only be met in the later stages of development, perhaps several decades after the advent of the new approach to rejuvenation. Producing a mature product that meets the early visions needs the participation of an entire industry, much of which typically does not exist at the start of the process.
Every new technology goes through this cycle, lasting decades from start to finish. The life span of a technology is perhaps fifty years, depending on where one wants to draw the line between a given technology and its next generation, and the first decade can be quite the wild ride when it comes to raised expectations and sudden disillusionment. Human beings are just built this way, the
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