The new January 2013 AARP Bulletin has an extensive article that asks the question.
AARP Bulletin - January/February 2013
This will be interesting to those who are not yet eligible for medicare, and who may not have a clear understanding of pland A,B,C, and D.. and the cost, the amount of coverage, and the deductibles.
The eye catcher headline is Average Healthcare cost for a couple in retirement is $240,000. The details of many other covered or not
covered expenses such as hearing, vision, dental and doughnut hole prescription drugs are also shown.
One interesting and scary statistic was the cost of being in a hospital... $2,000/day and an average hospital stay cost of $9600.