The smart ones are correct, the hayflick limit on cell division is a nonhormonal longevity limiter. Plus, Hgh hasn't really been shown to lengthen life, from what I've read. It's main benefit is quality of life. Kinda like in Brave New World: Strong and healthy until 60 or 70, then out like a light. Not that I think it's a bad idea, unless I could get a cool cybernetic body with my brain in a bowl of colored fluid I wouldn't want to live 120 years connected to machines and unable to move, sense, or communicate.