When it comes down to it, 75-year-old tax lawyer George Hrdlicka continues to practice law at the firm he helped found in 1965 because he can think of nothing he’d rather do than work.

“What would I do with this time if I didn’t spend six or seven hours a day practicing law?” Hrdlicka says, noting that his hobbies of gardening, reading and motorcycle road trips don’t fill his time.