Let's see how the adults like it (great video about field size from the soccer world)
A group of adults get to experience what it is like to be one of the kids playing on a full size pitch, by using a supersized goal and field of play at St. George's Park
In 10U level play the Classic League voted to move to small ball in order to improve the skills of all players by increasing the number of touches each player gets during games. the 8 v 8 format allows for 2 attackmen, 3 Midfielders, 2 defenseman and a Goalie. Keeping the 3 Midfielders allows the coaches to teach the triangles which are important to the game development.
The recommended field size is a smaller playing area. The optimum way to configure your 10U field is to use orange cones running the length of the field on the wing lines, effectively narrowing the field by eliminating the alleys. If you can line a crease or use a temporary crease (such as a Bownet) and bring the creases closer together that is allowed also. Some programs will by necessity need to run sideways on a field similar to how the 8U field sizes are configured. The home coach should ensure that the visiting programs are aware of this fact that the fields at 10U will be much smaller. 10U games are still played using four 10 minute stop time periods, the same as 12U and 14U times. Team roster sizes are usually in the 15-18 player range.
8U continues to be small ball on a small field. They play 7 v 7 for the same reason, more touches. The big difference in 8U is that they play two 25 minute running time halves. Team roster sizes are usually in the 12-15 player range.
In the case of any discrepancy or disagreement between coaches and or officials, the rules expressly mandate that MBYLL league rules apply. Many people mistakenly think that the home field team gets to select home ground rules, which is not true.