Japan!
If you have the opportunity to come to Japan, I highly recommend you spend time in the countryside.
As you know, there are many people who are over 100 years old in Japan. Why they can live until they are 100 is because of their behaviour. For instance, food, exercise, having social connections and so on.
Here is a link:
https://youtu.be/wGqFFcAaTn8
This video talks about a special meal which Japanese people eat on New Year's Day and you are going to notice what the important things are to live more healthily and longer.
It is sometimes difficult to get to the countryside because there might not be enough public transport. However, it is worth visiting!