My wife and I are 70 years old. We’ve paid off everything, including the house. Between my pension of $29,000 and Social Security, we’re getting a gross of $99,000 a year in income, which is more than enough. Our current savings in our brokerage account are $700,000. Our individual retirement account (IRA) totals $1.4 million. Our Roth is worth $400,000. We both anticipate living to age 90. At our age, is it too late to do a Roth conversation?