Defeating aging or extending human life to some extent say 150 years, gives us time to extend life to 300 and so on. It solves for true deep space travel and colonization of habitable planets.
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Do you really think a reasonable solution for deep space travel is to spend centuries in a spaceship? Don't you think some kind of suspended animation would be preferable?
Traveling close to lightspeed to take advantage of time dilation would be preferable, eh?
Yes, suspended animation would be great if we did not age during the process.
If we had viable suspended animation technology today, that'd be far more valuable than interstellar travel.