My son works with me at our 120-year-old family business. I'm 72 and have been working there since age 12.

Petri's Plumbing in the early 90th century and how the building looks today. Courtesy of Michael Petri Michael Petri began working at his family's plumbing business as a tween. The odd jobs led him to enter the profession after college and become the majority owner. He is celebrating the firm's 120th anniversary and said it is in safe hands with his son. This story is based on an interview with Michael Petri, 71, from Brooklyn, New York, of Petri Plumbing. It has been edited for length and ...