Maskot / Getty Images Before making any changes, you'll want to review your retirement savings and planned spending holistically. Key Takeaways Morningstar’s new analysis suggests a 3.9% starting withdrawal rate gives retirees a high probability of not running out of money during a 30-year retirement. Delaying Social Security until age 70 can meaningfully boost lifetime retirement income, but it may require temporary spending cuts or bridge strategies. You've done the work of saving for retirement, ...