David Blanchett, head of retirement research at Morningstar Investment Management, ran the numbers on the actual spending patterns of retired couples over 30 years. He tracked three annual spending levels: US $25,000, $50,000 and $100,000. He found that as couples aged, they withdrew less than anticipated, mainly because they had simpler lifestyles. As a result, many retirees may need 10% to 30% less in savings than planners suggest.
Source: Morningstar Investment Management