Health Math

Here's a little math problem. Let's see who can solve it first. The question is this: How much money would you need to give to a 21-year old today, in a lump sum, so he can invest it and pay for his lifetime of healthcare?

Your assumptions are as follows:

-        Life expectancy: 85

-        Health insurance currently costs $6,000 per year

-        Healthcare costs rise 10% per year

-        Investment income averages 4% per year after taxes

-        You can spend your principle too, so...