It Was the Best of Times, It Was the Worst of Times All about how missing the best market days (or the worst!) might affect your portfolio. Related Content What Is My Life Expectancy? Estimate how many years you may need retirement assets or how long to provide income to a surviving spouse or children. Saving for Retirement This calculator can help you estimate how much you may need to save for retirement. The Richest Man in Babylon In good times and bad, consistently saving a percentage of your income is a sound financial practice.