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WhereIsMyFreeStuff wrote (edited )

Negligible senescence is associated with increased telomere length. Longer telomeres are hypothesised to promote formation of cancers, but also the 'recycling' of telomeres by telomerase is energetically expensive.

Therefore, since evolution occurs over long periods of time, humans may just not yet have adjusted to the abundance of energy available to those who can afford it.

Here is an article I found on the topic

Edit: wasn't quite happy with my wording