"Unlike the pronatalists, who want to solve depopulation problems by bringing in entire new demographic cohorts of people, who are likely to have radically different values from us, on a mass scale, I'd rather we preserve our culture and focus on keeping alive and healthy the people we already have."

Our brains are optimized for the world we grow up in, so new brains are always going to be more fit than older generations. I'm all for extreme longevity, but if we're not actively illuminating our universe with brilliant new minds, what are we even doing here as a species?