New Medicare enrollees can expect their uncertain medical expenses to take roughly $67,000 out of the household budget, on average, over the rest of their lives. Since this estimate is only an average, some retirees will pay less and some will pay much more. And the estimate, revealed in a new brief by Karolos Arapakis at the Center for Retirement Research and based on a larger study, includes only the copayments and cost-sharing charges paid by retired households over 65. It excludes their single largest medical expense – monthly insurance premiums. The estimate is, nevertheless, a useful benchmark for older workers and retirees who want to get a better handle on their health care spending, which is very difficult to…