Why Do People in Football use the term "Kid"

In the NFL or any football realted thing, when people are scouting players they say that kid is really good. People say kid becuase there newbies in the NFL. So it's just like if you're three years old you're still new to the world. If you've been out of college for three years and playing for three you're still new to the NFL. For example, there was this kid in the NFL draft of 2015 and his name is Marcus Mariota and he's a quarterback. He was drafted second overall and he went to the Titans. And when he was first called by the Titans, the coach's last words were "You ready kid?"