Stating the obvious that "This is not an official Statement from American Ninja Warrior" kind of disclosure kind of thing. With that being said, Go ahead and fill out the application, you must be 21 the DAY you set foot on the starting platform. Casting team is amazing as usual and as long as you put in your audition video that your B-day is so and so, you should be fine. Good lucky on your application.
#BehindTheSceneNinja This profile represents my opinions and mine alone.