Board Thread:Naruto Discussions/@comment-26320097-20150423120614/@comment-3965545-20150426080806

No it doesn't. That's your assumption based on the fact that only Naruto's generation were all 12 and graduated at the same time. Guess how old Obito was at graduation? 9. Kakashi? 5. Gai? 7. Itachi? 7. Minato? 10.