Hollywood has nothing on Greater Boston’s technology world when it comes to an obsession with youth. From Kendall Square to the Innovation District, companies trip over each other every day to recruit new, fresh-faced tech talent that can help them go public.
In that culture, John and George Hatsopoulos stick out like a couple of sore thumbs. John, the chief executive of Tecogen Inc., is 79 years old, which makes him George’s kid brother. This chief executive is playing tennis — not extreme sports — during his spare time.