In October, the Center for Retirement Research at Boston College published a research paper showing how policies in the Netherlands that delay retirement can increase longevity, especially for men. The working paper, “How Does Delayed Retirement Affect Mortality and Health?” was written by research economists Alice Zulkarnain and Matthew S. Rutledge. The authors observed that older Americans have been retiring later for a number of reasons, including because work is becoming less physically demanding, employers have shifted from defined benefit to defined contribution pensions, and Social Security’s incentives are changing. The researchers cautioned, however, that understanding the implications of working longer for mortality and health is complicated, because people who are healthier tend to work longer than people who are less healthy.