Private $US20,000 ($32,000) health clinics offering genome sequencing and full-body scans. Gyms with $US40,000 annual fees. Blood plasma exchanges for $US10,000 or more a pop. One-on-one sleep coaching and $US300 wearables.

Pursuing “longevity” has become an expensive – not to mention time-consuming – hobby. But it doesn’t have to be: experts say many of the practices that are most likely to extend your life are also the cheapest.