Well, Elon Musk hasn't figured out how we'll inhabit Mars (just yet). But he HAS proposed a way to get a small civilization (of 1 million people) there. His space shuttle will board 100 people at a time, so it will take about 50 years to accomplish this number, putting him potentially over a 150 years old by the time he is able to enjoy his legacy.
But don't worry. By that time he will have been taking an anti-aging serum that he invented while in zero-G, and he will have also invented a time machine that allows him to go back and deliver the serum to himself while still at the ripe age of 45. So he'll essentially ALWAYS look like this:
I pulled this image from some guy's blog. I don't know where it originally came from. Probably Tesla.
Read more details on Mars and SpaceX announcement today from the full article here, at The Verge.