https://journals.sagepub.com/doi/abs/10.1177/074873049701200205 … very weird: nonhuman primate lives 9-10 seasonal photoperiod cycles (days getting short and then long again) and if you speed up those cycles its lifespan drops 30%. If you slowed down the photoperiod cycle could you *increase* lifespan?!
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Replying to @s_r_constantin
Are you sure it’s good science? I intuitively mistrust this result.
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Replying to @diviacaroline @s_r_constantin
I suspect that senescence is not a design shortcoming, but planned obsolescence to facilitate generational change. It is not implausible that the timing of senescence may be influenced by somehow counting years.
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it depends; some organisms do stay fertile through their lifespan. If aging has an "unavoidable" component ("wear and tear", "entropy", "oxidative stress", etc) such that children of older parents are less likely to survive, then there's an evolutionary incentive to *add* ...
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..."programmed" aging, to divert resources away from less-healthy elders and towards healthier children. This would make aging more pronounced, particularly in ways that make the body less energy-expensive (like loss of muscle mass).
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I suspect that Blue Zones (later senescence) may emerge where environmental change is slower (eg small islands). If correct, increasing rate of change in environmental conditions, food sources etc. might result in faster senescence and earlier fertility?
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