Within the last 1000 years, the life span of the Human being has quintuplied for women, and quadrupled for men. Middle-Age used to be 18 for Women, and 20 for Men (yep, Men used to live longer...).
Girls were married very early on. But, now, look at us. So, really, I don't see it as much of a surprise that, we're projected to be finding ways to live to be 1,000.
In 1000 years, we'll probably be living to be 380 or thereabouts without the use of external stimuli anyway.