5 Reasons Not to Retire Before 66

Just over half of Americans retire between the ages of 60 and 65, making this the most popular age range for retirement. By comparison, just 12% retire between 66 and 69 and just 10% retire in their early 70s.

Retiring young may happen out of necessity if you can't find a job or aren't physically fit for work anymore. Unfortunately, if you leave the workforce before you're at least 66, the financial implications of this choice could affect your future in profound ways.

You don't want to jeopardize your retirement by retiring at the wrong age, so before you hand in your notice, be sure to consider these five key reasons why you shouldn't say goodbye to your job so early.

Alarm clock and money sitting next to a jar full of coins labeled retirement
Alarm clock and money sitting next to a jar full of coins labeled retirement

Image source: Getty Images.

1. Your Social Security benefits will be smaller

If you were born between 1943 and 1954, 66 is considered by the Social Security Administration to be your full retirement age (FRA). That means you can retire and get your standard benefit at 66. For those born in 1955 or later, full retirement age gradually increases; and for anyone with a birth year of 1960 or later, FRA is 67.

If you retire before FRA, your benefits are reduced. If you retired and claimed benefits at 62, the earliest possible age, you'd receive just 75% of your standard benefit if your FRA was 66. If you delay until age 70, however, you earn delayed retirement credits and you get bigger benefits.

While you need to do the math to determine how many years of higher benefits you'd need to break even after delaying, many financial experts believe it makes sense to work longer to try to get higher guaranteed benefits from the Social Security Administration.

Benefits may also be smaller if you retire before 66 because you may not have enough years of work to maximize your benefits under Social Security's formula. Social Security considers your highest 35 years of earnings, adjusted for wage growth, when determining benefits. If you haven't worked for 35 years, you'll have years of zero dollars factored in -- so it can make sense to keep working to eliminate those years from your benefits calculation.

If you're earning a much higher income (after adjusting for inflation) in your 60s than you did in your 30s, staying on the job a little bit longer could mean a significant boost both because of delayed retirement credits and a higher average wage for Social Security's formula.

2. You'll miss out on years of saving

Once you retire from your job, you aren't going to be able to keep contributing to your workplace 401(k), assuming you have one. Retiring early means years of missing out on investing with pre-tax dollars that you can use to help fund your retirement.