All-Pro tight end retired in March after nine prolific seasonsGronkowski estimates he suffered 20 concussions in his life Former New
England Patriots tight end Rob Gronkowski, who announced his retirement in March, said in an interview that he absorbed about 20 concussions in a lifetime on the gridiron.
Gronkowski, 30, told CBS News correspondent Reena Ninan that he would only allow a future son to play football after educating him about the suffering he endured during nearly a decade in the trenches.