Rob Gronkowski is sitting on a football-sized nest egg after his career in the NFL - but he's barely spent it. "To this day, technically I have not spent any of my NFL money," Gronkowski, 36, revealed on the Tuesday, December 30, episode of the "Bussin' With the Boys" podcast. The retired New England Patriots tight end pointed to his investments and initial signing deal as the main reason he hasn't touched his actual NFL salary.