Study finds 194-year-old tortoise is 'aging more slowly than you would expect'
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KELLY: Is it notable that Jonathan is a he? Among humans, it's females who tend to set records for longevity.

GERLACH: The largest giant tortoises tend to be males. So the males grow faster. They put effort into growth, whereas the females put a lot of resources into eggs. The bigger animals tend to get the most notice.

KELLY: Interesting.

GERLACH: So it's really hard to answer whether that affects the age or whether it's just our bias towards these really dramatic big animals.

KELLY: So let's get to the research and the why Jonathan has managed this incredibly long and, it sounds, quite pleasant life. It has to do with his genes. In a few sentences, what did your team learn?

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