“I’m never comfortable,” says Greenberg. “The dreams and ideas are bigger than before.” And that’s because he has a different idea of retirement: “Retirement isn’t what people think. Retirment is probably doing 85% of what you like. Then you’re retired. My goal is to always be retired that way, not retired like my father, who left something he was doing, stopped working, and started to sort of deconstruct in front of my eyes.
The secret to growing old and staying vital, says Greenberg, is “You always have to be growing, you always have to be changing.”