Social Science & Medicine is publishing a study by the University of Warwick and Dartmouth College that found that the risk of becoming depressed peaks at age 44. The study used data from two million people in 80 countries.
Professor Oswald said for the average person, the dip in mental health and happiness comes on slowly, not suddenly in a single year.Link (Via Mind Hacks)
Only in their 50s do most people emerge from the low period.
"But encouragingly, by the time you are 70, if you are still physically fit then on average you are as happy and mentally healthy as a 20-year-old.