I came across 2 articles in The Economist which I think you will find interesting.

The first discusses the level of self reported well being at different stages of our lives.  Apparently we bottom out around 50 and peak as we get older, hitting an all time high in our 80s. 

All I can add to this is.........hang in there !!

The U-bend of life
http://www.economist.com/node/17722567?story_id=17722567

This second article look at the impact of posture on how people viewed themselves.  In short, stand up straight, pin your shoulders back and stand proud.  You will then feel better about yourself.  Give it a go !!

The Power of Posture
http://www.economist.com/node/17899714

This video goes for 18 minutes and is interesting viewing.  He discusses the  power of social networks and whether they are making you overweight and unhappy or not.