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You need to have an idea of how long you could live to better fund your retirement.

Your longevity is one of the most significant unknowable factors that determine how much you need for retirement, how much you can spend, how much time you have to do the things you want to do and more. Estimating your longevity using one of the best life expectancy calculators can be a good way to improve the accuracy of your retirement financial and lifestyle projections.