If we do triple our life expectancy, it's probably best if we do what you're implying and delay the time before we have kids by the same amount of time. Otherwi

If we do triple our life expectancy, it's probably best if we do what you're implying and delay the time before we have kids by the same amount of time. Otherwise we'll have to get used to having eight generations living at the same time instead of the three we have now - and that'll mean that we more or less triple the population. We're apparently struggling to feed six billion now, which problably means that we'd need to get rather creative to feed eighteen billion.