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If I aged at a tenth of the normal rate I'd be worried a) that I might be taken and experimented on, plus b) think people might kill me out of jealousy so if there is someone who is 400 years old but looks like 40 years old I wonder if we would actually know about him or her they may have changed identity a few times. Alternatively someone may have already developed a serum to extend life but it cannot be released because then the planet's resources would be consumed even faster with a huge fall in the death rate. It might be limited to a privileged few. Even if that hasn't happened yet it could in a few years.