lol, the coffee, sex and lentils are only a small part of the equation. Naps are actually good for your mental health as well, improve your rate of learning new things and reduce your chances of dementia.

I think the main things it boils down to are:
A: A friendly, supportive, laid back community.
B: Keeping busy with your hobbies and work no matter how old you get. Note that they're never in a hurry to do anything, however.
and
C: Eating natural, healthy, unpoisoned food. High nutrient contents in food also help with improving health, and far better to do it in the soil rather than taking them in pills. Store bought lentils full of pesticides don't really count for that, though. Growing your own garden is bonus points, though, since it's a relaxing and rewarding activity in and of itself.
If you read the whole article you'd see that they did eat meat about 5 times per month, mainly pork and fish, so it's not like they were pushing vegetarianism. Actually in the early 1900s the American diet was similar in that regard; meat is expensive and was more an item for the "sunday roast" and special events.
Meat is more available today in low-quality form thanks to factory farms. The main reason meat is "bad for you" today is because the animals in factory conditions are extremely unhealthy as well, often dying from heart attacks and other organ failures which they then pass on to us. Dairy is the exact same way; a healthy cow or goat eating a natural diet will produce healthy milk, whereas a factory cow will produce only poison. Same with eggs, and so on.
One other thing, there's no way that the goat's milk they eat is pasteurized. Pasteurization really ruins any nutritional value that milk might have to offer.