Slow Gompertzian aging in long-lived C. elegans results from expansion of decrepitude, not decelerated aging
Abstract
The Gompertz equation describes exponential age-increases in animal mortality rate arising from biological aging. Its parameters, and {beta}, are widely used to evaluate lifespan-extending interventions and human mortality patterns: it is assumed that reduction in {beta} corresponds to deceleration of aging rate, and reduction in to reduced aging-independent mortality. However, this view has never been empirically validated. We therefore investigated the biological basis of and {beta}, by simultaneous quantification of mortality and age-related health in long-lived populations of the nematode Caenorhabditis elegans. We show that {beta} reduction arises not from decelerated aging but expansion of decrepitude in longer-lived individuals, whereas reduction arises from decelerated aging. This empirical re-evaluation of Gompertzian aging inverts and challenges long-standing ideas in the biodemography of aging.
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Research summary
The paper claims that the reduction in the Gompertzian aging parameter {beta} in long-lived C. elegans is due to an expansion of decrepitude rather than decelerated aging. This research is relevant as it challenges existing paradigms in the understanding of aging and mortality, providing insights that could inform future longevity studies and interventions.
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