Fortunately biology is a lot less tractable than naive people imagine, and dreams of "saving humanity by taking to the stars" are hilarious. If any sentient human (of which there may be as many as ten at any point in time) were doomed to live to 200 years of age they'd probably commit suicide well before then, having grown weary of watching the same old stupidity over and over and over and over again. Dressing stupidity up in whizzy technotoys doesn't make it any less depressing. Of course the great mindless mass of humanity would be perfectly happy to spend 200 years on the sofa cramming McSlop down their throats while gawping and drooling over some infantile entertainment. Until we accidentally exterminate ourselves, that's our real future. Only without the 200-year lifespan. Remember: atrociously inadequate lifestyle choices have made US citizens the first people in history to have, on average, shorter lifespans than their parents. McSlop for the body and McSlop for the brain outweigh any minor breakthroughs in longevity-related quasi-discoveries.