I'd love to see a study that keeps track of these people at every decade, 30, 40, 50, etc. From talking to people, the relationship between children and happine

I'd love to see a study that keeps track of these people at every decade, 30, 40, 50, etc. From talking to people, the relationship between children and happiness is very much parabolic, in that in the beginning it's great, then it's not so great, then kind of terrible, then not so bad again, then eventually amazing. I would imagine the relationship between happiness for those to be childfree to be more linear in that you're happy but it sort of just fades slowly away.