This is a little myopic, GP is clearly trying to posit that "there are less unhappy people above 40 because they are more death-prone than their happy peers".

This is a little myopic, GP is clearly trying to posit that "there are less unhappy people above 40 because they are more death-prone than their happy peers". I've seen some science headlines that sound like that's the case, but I haven't read the papers so take it with a dumptruck full of salt.