Since then, interest in the U-bend has been growing. Its effect on happiness is significant-about half as much, from the nadir of middle age to the elderly peak, as that of unemployment.

此后，人们对马蹄形趋势的关注日益增长，它对幸福感的作用十分显著，从处于最低端的中年时期到达随后的顶峰年纪，正如失业率趋势一样，且具有全球普遍性。