Data noted by the LEF News provides a practical demonstration of "use it or lose it" for the retired set. "You'd think that retiring would make you healthier. Finally, you can leave all the stress of the working world behind. Think again. Complete retirement leads to an 11 percent decline in mental health, an 8 percent increase in illness, and a 23 percent increase in difficulty performing daily activities over a six-year period ... The declines in health are much lower and, in some cases, nonexistent for those that continue to work part time. ... Working longer is not always the path to better health, of course. If your work is routine and stressful or not intellectually challenging, then working longer can actually hurt your health. [The objective] should be to find a job that keeps you meeting fulfilling goals. ... There seem to be health benefits to keeping all of your body parts moving including the nerve cells in your brain."

Link: http://www.lef.org/news/LefDailyNews.htm?NewsID=4417