Conversation

And it could help permanently if people decide to have more children, on average. That might happen if longer lifespan means people feel they have time for both children and a career. (Remember that fully curing aging meaning maintaining reproductive health for all those years.)
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If individual humans had much longer lifespans, it would be no problem to spend 30 or 40 years just learning before you make major contributions. And you could spend another 10–20 picking up a couple more specialties in disparate areas.
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3. Long-term thinking How would people's thinking change if they felt they were going to live 150, 300, even 1,000 years or more? The very long term becomes much more personal. Posterity is something you're going to be around for.
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I still think the “old guard” problem is real, and we'd have to come up with new mechanisms to address it. (Perhaps influential positions would institute a mandatory retirement age of 350.) But there are other factors, and it's not clear what the net impact would be.
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(Not that any of this is an argument for or against curing aging! The knock-down argument for curing aging is that death is bad. In light of that, every other consideration pales into insignificance.)
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Incidentally, some people suggested that if we fully solve aging, we'll also preserve the neuroplasticity of youth, and that will solve the “old guard” problem. Maybe! But it might be as much a psycho-social problem as a physiological one. So we might need additional solutions.
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