The Amazon rainforest people who age more slowly than the rest of the world

As Martina Canchi Nate walks through the Bolivian jungle, red butterflies fluttering around her, we have to ask her to pause – our team can’t keep up.

Her ID card shows she’s 84, but within 10 minutes, she digs up three yucca trees to extract the tubers from the roots, and with just two strokes of her knife, cuts down a plantain tree.

She slings a huge bunch of the fruit on her back and begins the walk home from her chaco – the patch of land where she grows cassava, corn, plantains and rice.

Martina is one of 16,000 Tsimanes (pronounced “chee-may-nay”) – a semi-nomadic indigenous community living deep in the Amazon rainforest, 600km (375 miles) north of Bolivia’s largest city, La Paz.

Her vigour is not unusual for Tsimanes of her age. Scientists have concluded the group has the healthiest arteries ever studied, and that their brains age more slowly than those of people in North America, Europe and elsewhere.

The Tsimanes are a rarity. They are one of the last peoples on the planet to live a fully subsistence lifestyle of hunting, foraging and farming. The group is also large enough to provide a sizeable scientific sample, and researchers, led by anthropologist Hillard Kaplan of the University of New Mexico, have studied it for two decades.