In this video as part of The Motley Fool's "Ask a Fool" series, our senior advisor to the Fool's Rule Your Retirement service, Robert Brokamp, takes a question from a Fool reader, who asks, "Should you pay the income taxes owed from your traditional 401(k) and/or IRA with funds from your Roth 401(k) and/or Roth IRA when you're 70.5 years or older?"