There is a good reason to standardize the training environment for kids in their development years. Do you know what the US Youth Soccer standards are?
Asking to play up or switch to a different age group has many consequences. Check out the table above to see the adjustments that need to be made as kids mature or if they play up. It's not a matter of simply moving kids "up" to play with slightly older kids.
- “Rules of the Game.” US Youth Soccer, www.usyouthsoccer.org/referees/rules-of-the-game/.