If you can't afford 3 houses at 78 years old, you made seriously bad decisions in your working years. The average person retires at 65 and starts drawing social security and/or money from retirement accounts. Bernie is still working 13 years past retirement age, and being paid $174,000/yr to do it.
If I were making 174k/yr for the last 30 years, do you know how much money I'd have in investments and property? A fuckload more than 6 million.