> eat healthy

It sounds so simple, yet incredibly controversial when we go into the details.

The people actually living up to 100+ years usually have been drinking/smoking or doing some other drugs to some extent, and that alone is a whole can of worm in the current climate.

> having friends

They are many unreported elderlies living alone in the middle of nowhere minding their business. I remember a documentary about a guy growing mushrooms (Shiitake) in the forest and only getting down to the town every 6 months to give them to his wife, and he'd get back to being alone until the next time.