England:
"A child who has not attained the age of 6 shall not play, and shall not be permitted or encouraged to play, in a match of any kind." (S. 502)
S. 503 - wann wird 5vs5; 7vs.7; 9 vs. 9 und 11vs.11 gespielt - und zwar Maximum
Link zum Dokument
Mir wurde erzählt, dass der Schiedsrichter vor einem Spiel sagt mit wie vielen Spielern gespielt wird z.B. 7vs7 oder 8vs8 oder 9vs9 wenn das Maximum 9vs9 ist. Kann das jemand bestätigen?
Das hier würde dafür sprechen:
"The above table indicates the maximum number of players per team at that age group. If the competition would like to have smaller numbers, e.g. 7v7 at U11 or U12, this is allowed within this framework." (Quelle kann ich leider nicht verlinken)
Manchester Junior Respect League mit 12 Regeln u.a.
"No slide tackles — free kicks are awarded for offenders
No coaching instructions — coaching staff are not permitted to communicate instructions during play
Equal numbers — teams must be willing to lend opposition players if a full team can’t be put out
All positions — all players in a squad must be given time in every position, including goal
Silent spectators — spectators are not permitted to shout or call out at any point during a match. They can, however, applaud passages of play and goals"
Quelle
"The Football Association Laws for 9v9 Football
This guide provides the Laws for Under 11 and Under 12 versions of the game, with
children playing a maximum of 9v9. These Laws are also appropriate for other age
groups playing 9v9 football.
Please remember:
a) From season 2015/16 Under 11’s are not permitted to play in leagues where
results are collected or published or winner trophies are presented, this is
deemed to be detrimental to the development of the player and the game and
will not be sanctioned.
b) Under 11’s can play in a maximum of three trophy events during the season,
lasting a maximum of six weeks each. These are short-term experiences
helping children learn about winning and losing in an appropriate
environment. The winners of these events can be published and trophies can
be presented.
Except where other provision, in these Laws are made, the Laws of Association Football
apply. Each Law is numbered to correspond with the appropriate Law of the Game.
These Laws are mandatory unless special permission is granted by The Football
Association." (Quelle kann ich leider nicht verlinken)
In Deutschland brauchen wir aber Ergebnisse und eine Saison - zum Glück in manchen Gebieten eine Qualifikationsrunde (Herbst) und eine mit gleich starken Mannschaften (Frühjahr).
Ob die Kinder in England auch alle das 7 gegen 7 von Anfang an fordern? 
Ansonsten höchsten Respekt! Ich hatte mir das nicht so genau angesehen und war bei beiden Spielen Leitershofen-Diedorf dabei. Habe jetzt mal den Trainer gefragt, wie es zu dem 20:0 kam. Antwort folgt.