One of Kurzweil&#x27;s fudges is to say in Roman times life expectancy was 25 years or so and so it&#x27;s increasing exponentially but that&#x27;s mostly from been from getting rid of infant mortality and the like. I think ageing as in going grey and doddery has always kicked in at the same sort of age.<p>The immortality technology that seems closest to being doable would be to have AI &#x27;become you&#x27; in the way that actors become a character. Not quite sure how that would play out in reality, whether having a robo version of your gran wandering down the street would be a good thing. I was thinking maybe you could have some sort of architectural innovation where there is a physical city for the simulated immortals where you can go visit robogran if you feel like it.