So just waving away the insane technology leaps required, if we had a digital copy of our DNA we could theoretically create pristine new stem cells and inject them into our bodies as needed to replace aging cells. You might make such a master copy at birth, or more likely in such a world, you're conceived from the master copy which your parents carefully edited before deciding to have you.
Fundamentally we could live a really long time in the far future, which is maybe closer to us today than we are to 0 A.D.
Fundamentally we could live a really long time in the far future, which is maybe closer to us today than we are to 0 A.D.