I want to point to this self-help article by Arthur Brooks in The Atlantic, part of his 'How to Build a Life' series. It's bottom line, derived from data in the famous Harvard Study of Adult Development begun in 1938, is that Happy-well seniors accumulate resources and habits in their Happiness 401(k)s during their younger lives by practicing the following injunctions.
1. Don't smoke
2. Watch your drinking
3. Maintain a healthy body weight
4. Prioritize physical movement in your life
5. Practice coping mechanisms
6 Keep learning
7 Cultivate stable long term relationships.