> 1) There's a biological component where happiness follows a U curve. Mid 40's tends to bottom out on happiness then steadily increases. Useful to know since r

> 1) There's a biological component where happiness follows a U curve. Mid 40's tends to bottom out on happiness then steadily increases. Useful to know since riding it out is a viable strategy. [1] I'm not sure it's biological. I suspect it's because that's when people's lives tend to suck the most - they have all the demands of career and family, with very litle room for themselves. It would be good to study people who decided to drop out instead and see if they still follow the U curve.