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Yeah. For Scientific American Science quickly, I'm Rachel Feldman. In the animal kingdom, lifespans can stretch from mere hours to entire centuries, but that's just the start. Some creatures deteriorate so slowly that we've never

actually caught them dying of old age. Others don't seem to age at all. And some can

apparently reset their biological clocks and bounce back to infancy to start all over again.

Plenty of humans would like to figure out how that works and potentially harness

the ability for our own use. But science has a long way to go. The truth is that we barely

understand why or how we age in the first place, let alone how we might stop it. My guest today

is Jean-Pedro Magaliz. He's the chair of molecular biogerontology at the University of Birmingham in England,

and he's here to tell us all about the nascent science of aging.

Thank you so much for coming on to chat today.

My pleasure. Thank you for the invitation.

So I'm sure that all of our listeners know that different species have different lifespans,

but could you start by giving us a sense of some of the extremes that are out there?

Absolutely. It's been a mystery of biology for a very long time ever since Aristotle noticed

there's differences in lifespan across species. And we know that some animals have very short

lifespan, others have have very long lifespan.

And this happens even amongst closely related species like mammals.

For example, hamsters live about two years, mice and rats can live up to three or four years,

...