Let's face it. Unfortunately, lacrosse is one sport where there is no accountability for age requirements as found in other youth sports. But, from here on out these kids will be playing at the high school level and maybe someday in college; they will have to get used to this.
Let's stop worrying about who is better than who, which teams played the most/least competitive teams and won/lost, whether they "drove to the fields themselves, etc. Let them be the best they can be without blaming and knocking others. Teach them to play with their hearts!