The age at which you retire isn’t the only factor that determines how long you’ll be retired. The other important factor is your lifespan. We all hope to live to an old age, but a longer life means that you’ll have even more years of retirement to fund. You may even run the risk of outliving your savings and other income sources. To guard against that risk, you’ll need to estimate your life expectancy. You can use government statistics, life insurance tables, or a life expectancy calculator to get a reasonable estimate of how long you’ll live. Experts base these estimates on your age, gender, race, health, lifestyle, occupation, and family history. But remember, these are just estimates. There’s no way to predict how long you’ll actually live, but with life expectancies on the rise, it’s probably best to assume you’ll live longer than you expect.