How long will your parents' money last? That's the million-dollar question, right? Or perhaps it's more like the $100,000, $10,000 or $1,000 question, depending on how much your parents have in savings. 

You'll be happy to hear that figuring out how long your parents' money will last isn't as hard as it might seem. Here's the process you need to use to get a good idea of whether your parents have enough to support themselves through retirement.