[humbledrone]

Assuming you mean interstellar space travel (interplanetary spaceflight is quite achievable with current human lifespans and technology), we don't need to live longer to do it.

Due to the principle of special relativity, if you could build a spaceship that accelerates at a constant 1g, the people on the ship could get anywhere in the entire galaxy without aging more than 24 years [1]. So a person could easily travel from one end of the galaxy and back in a normal human lifespan. Of course to a "stationary" observer (e.g. on Earth) watching the spaceship, it would appear to take a couple hundred thousand years for the trip to take place. But this doesn't matter a bit to people aboard the ship (well, aside from the fact that everyone they left behind on Earth would be dead just a few months into their trip).

So the hard part isn't getting people to live long enough. It's building a ship that can accelerate at a constant 1g for years on end. :)

[1] https://en.wikipedia.org/wiki/Space_travel_using_constant_ac...

[m-j-fox]

I had this thought but the downer is: where are you getting your energy? And all of the mass you need to eject to keep your rocket accelerating, you'll have to carry with you. I guess if you could stop and eat some suns along the way -- but we're not talking about current technology anymore.