A University of Alberta study is helping crack the code to happiness by exploring the long reach of depression and anger over more than two decades.

The study, published recently in the Journal of Family Psychology, followed 341 people for 25 years, and found that negative emotions they may have suffered as young adults can have a lasting grip on their couple relationships, well into middle age.

The fact that depression and anger experienced during the teen years clung to people, even through major life events such as child-rearing, marriages and careers was surprising, said University of Alberta researcher Matthew Johnson.

http://www.sciencedaily.com/releases/2014/05/140507132705.htm