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Age Reversal Breakthrough: Harvard/MIT Discovery Could Enable Whole-Body Rejuvenation
(scitechdaily.com)
This is a most excellent place for technology news and articles.
I doubt that will be the reality of any such breakthroughs, at least not for a long time. But I think the solution in such a scenario would have to be sterilization of everyone on earth by default. Sterilization which could be temporarily reversed to allow someone to have a child via a controlled application process just to meet the rate of replacement.