 check out our really young pro soccer player. Philadelphia Union midfielder Kevin Sullivan is the youngest ever in MLS. He's just 14 years old. He made his debut in Wednesday night's game against the New England Revolution, coming in the game after his brother Quinn scored a goal for the Union in their 5-1 victory over the Revolution as broadcast on Apple TV. Now having a strike towards goal on a night that's about his brother, Quinn Sullivan says, I'm still here.