I enjoyed this article and thought some of you might also - 4 lessons from the longest-running study on happiness.
Originally Posted by excerpt from article
1. A happy childhood has very, very long-lasting effects.
2. But … people with difficult childhoods can make up for them in midlife.
3. Learning how to cope well with stress has a lifelong payoff.
4. Time with others protects us from the bruises of life’s ups and downs.
In an article dated April 12, 2017, TED author Daryl Chen highlights the results of a longitudinal Harvard Study of Adult Development, which spanned 78 years and is ongoing: a second-generation study is now underway. One point in the article discusses adjustment to aging and is highlighted in this post.

There is a TED Talk video related to this article, found here: What makes a good life. This is somewhat similar to the forum thread What is "successful"?