The greatest unknown in retirement planning is the uncertainty of future healthcare expenses. On average, they will total between $250,000 and $300,000 for the typical retired couple. And this is for out-of-pocket spending--after all the insurance and other benefit programs have helped pay medical bills. Although it's admittedly a bit whimsical, one way to cushion the impact could be to invest in a portfolio of healthcare companies that cater to an aging population. These are firms whose products and services are particularly keyed to an aging population. ... Full Story »