 invested in a good mutual fund or series of mutual funds, if it averages 10% or more, will double every seven years. You're 37, you said? Yep. So let's pretend we put 400 in investments. When you're 44, you'll have 700. When you're 51, you'll have 1.4. When you're 58, you'll have 2.8. Yep. See how this changes your family tree? Yep.