teaching defensive schemes

ol' gus

11-man fan
Can anyone give me a research based reason to start teaching which defensive schemes will work best against certain offensive schemes at a specific age level?
 
I dont think i was very clear. As a new coach who is just working with a bunch of other dads i need to know if there is a certain age you start teaching defensive schemes to match offenses?
 
Just my opinion but I think in youth to jh even you should be running umbrella defenses that convert well no matter the offense. i.e. 23 or 2-2-2
 
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