James Fotenos knows he is playing a young people’s game.

All the leaders at Greene Radovsky Maloney & Share are — but the firm’s founders and senior partners are well into their 50s and 60s. Though they say they have no intention of slowing down any time soon, they have come to the realization that hits every founder firm: If they are to pass their legacy on, they will have to make sure they have the horses to pull the carriage.