When it comes to the different expenses you’re going to have in retirement, most of them are fairly predictable.  But there’s one that could range from a little … to a lot:  Healthcare.  You might get lucky … or you might suffer a major illness that wipes out the savings you thought would last you 20 or 30 years.  So, how can we plan for healthcare, when we really have no way of knowing how much it’s going to cost us?