It's New Year's resolution time, and chances are you've once again put "exercise" on your list. Here's an incentive: Do it, and you may get to put "exercise" on your list for many years to come.

A new study in the British Journal of Sports Medicine concluded that older adults who followed a regular physical exercise regimen were seven times more likely to remain healthy than those who were not physically active. Researchers followed 3,500 adults with an average age of 64 and found those who said they exercised regularly over a four-year period had fewer cases of dementia, depression and other serious health problems. Even those who said they had been physically inactive but began and sustained an exercise regimen late in life reaped the health benefits.