A friend pointed me towards this insightful article in the Economist about what I’ve been calling the “U-shaped happiness curve." (In Britspeak, that’s “U-bend.”) It attributes widespread corroboration to “a new branch of economics that seeks a more satisfactory measure than money of human well-being,” and observes that the U-bend shows up consistently and globally across 40 years’ worth of data, even when scientists control for cash, employment status and children.
The accompanying graph, which shows self-reported well-being increasing steadily after the age of 50, ends at 85. I wonder how long it will take for those economists to extend the X-axis to age 100. As to what the graph will then show, I take heart from gerontologist Marc Agronin's findings that "compared to their younger peers, centenarians cope better with stress, are generally less anxious and depressed, and have increased levels of life satisfaction, even when their functional limitations are greater."