The field sizes are set out in the AYSO National Rules and Regulations. Region 13 mostly uses these sizes
|Length (yd)||Width (yd)||Goal size (ft)||Locations|
|6U||30||25||4 x 6||Victory, FIS, JR|
|7U||40||27||4 x 6||MacDonald, LDS|
|8U||45 – 50||30||4 x 6||FIS, Victory, PCY, JR|
|10U||55 – 65
|35 – 45
|6.5 x 12||Victory, Muir, Brookside|
|12U||80||45 – 55||6.5 x 18.5||Victory, Muir, McKinley|
|14U||100 – 130||50 – 100||8 x 24||McKinley, Blair|
The 7U fields at LDS are 42 x 30. I think they’re a little too big for that age, and 40 x 27, like at MacDonald would be better. Or maybe even a little smaller.
The back 8U fields at Victory are 45 yards long. The rest are 50 yards long.
10U fields at Brookside are 44 yards wide.