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. You are viewing this website at a small screen resolution which doesn't support calculators. Click here to view this calculator. Have A Question About This Topic? Name Email Address Question Thank you! Oops! Related Content Put It in a Letter A letter of instruction provides additional and more personal information regarding your estate. Changing Unhealthy Behaviors Five phases to changing unhealthy behaviors. Taxable vs. Tax-Deferred Savings Use this calculator to compare the future value of investments with different tax consequences.