Lifespans depend on far more than just one thing, but multiple. Telomere shortening is a contributor, mitochondria may be, senescent cells, stem cell death, mec

Lifespans depend on far more than just one thing, but multiple. Telomere shortening is a contributor, mitochondria may be, senescent cells, stem cell death, mechanical issues like joint or tooth wear down (partly coped in humans for now but very much an issue in other animals especially mammals which for some odd reason, in general don't have constantly regrowing teeth), etc etc.