Not only does he become the youngest head coach in the National Football League , he 's the youngest NFL head coach since at least the AFL - NFL merger in 1970 .
McVay , 30 , celebrates his 31st birthday on Jan. 24 .
Not only does McVay become the youngest head coach in the National Football League , McVay 's the youngest NFL McVay   since at least the AFL - NFL merger in 1970 .
McVay , 30 , celebrates his 31st birthday on Jan. 24 .