A new study says that we all tend to be at our most unhappy phase at the same point in life. According to a study by the US National Bureau of Economic Research, 47.2 is the unhappiest age you can be. To put it simply, it's when your midlife crisis statistically peaks. Dartmouth College Professor David Blanchflower studied data from 132 countries to measure the relationship between well-being and age. Professor Blanchflower concluded that every country has a “happiness curve”, which is U-shaped over lifetimes.