I don't buy this argument. First of all, the implication is that by increasing lifespan we'll increase some other kind of cost. I actually suspect it would be e

I don't buy this argument. First of all, the implication is that by increasing lifespan we'll increase some other kind of cost. I actually suspect it would be entirely the opposite - that by increasing lifespan we'll increase healthspan, massively reducing healthcare costs, increasing years where an individual is an economic boon, etc. Second, there's a huge difference between "we've made everyone immortal" and "we've increase average lifespan by 5 years". If average lifespan goes up 5 years I don't think we will have a ton to worry about in terms of "oh my god there are SO MANY more people!" etc. So I just don't buy it being this huge thing to plan for.