Foundation phase is for the following ages and formats:
U7/U8 – 5v5
U9/U10 – 7v7
U11 – 9v9
https://community.thefa.com/england_dna/p/age-phase#foundation
Foundation phase is for the following ages and formats:
U7/U8 – 5v5
U9/U10 – 7v7
U11 – 9v9
https://community.thefa.com/england_dna/p/age-phase#foundation