Your health. Continuing to work could have a positive impact on your health. A recent study of about 429,000 self-employed workers in France by the French National Institute of Health and Medical Research, found people who retire later have a lower risk of developing dementia. "For each extra year of work before retirement, it lowers the risk of getting dementia by 3.2 percent," says Carole Dufouil, a director of research at the institute. "This is in line with the 'use it or lose it' hypothesis, which says that as long as you use your brain, it is efficient."

Bigger Social Security checks. You get bigger Social Security benefits if you delay claiming your payments between ages 62 and 70. For example, a baby boomer who could get $750 per month at age 62 would get $1,000 per month at age 66 and $1,320 monthly at age 70. After age 70, there is no additional benefit to delaying your payments. Social Security benefits are calculated based on your 35 highest-earning years in the workforce. So, if you earn more than you did earlier in your career, you could further boost your payments.