|Age 6 (or younger depending on my mood and person's opinion), based on the clip above|
Riddick was honestly very worried about papa. He was waiting with [Character] to get the OK to come into the medbay but he was honestly getting scared by all the ruckus, swearing, and screaming coming from inside. Eventually though, Tullk opened the door, "Cmon in," he assured [Character] who gently took Riddick's hand leading him inside where Yondu laid exhausted, but admiring a little bundle in his arms. [Character] and the little boy made it to the bed.
"Both o' Y'all meet Vito Udonta," Yondu introduced. Riddick looked on in amazement as baby Vito seemed to do the same. In a sudden moment though, Vito grabbed onto a handful of Riddick's hair, tugging curiously and kicking, it startling, and hurting, Riddick enough for him to burst into tears, Vito doing the same, after having released his brother.