Originally Posted by u-Bob

"Quality of life" is purely subjective and therefor should not and can not be basis for a "rule" or "law".

Some people will be perfectly happy playing with their jigsaw puzzles all day long while others need excitement. Some people will be happy on their own, while others get depressed if they don't have other people (their family for example) around them. Some people like to travel while for others merely the idea of leaving their home town is enough to cause them a lot of stress. What's relaxing for one person, another one will find boring. etc.

There's no way to measure people's "level of happiness" or "the quality of their life".