Before he left, the bulk of the characters-including the Konoha 11-were about 12 to 13. Once Shippuden began, however, they were about 15. The sequel series took place over two years, and the bulk of it happened while Naruto was 16 years old.
Naruto was released 1 episode per week... but there are some many double episodes... then there was 1 week off, and on the second week the double episode appeard, so we had to wait 2 weeks. Most of the time it was because another anime (i think it was "detective conan" / "case closed") that wants to make a double episode..... but sometimes it was because Naruto wants to make a very special episode (some the most hyped episodes where in double episodes) But sometimes there was no episode because of a japanese national day without a followed up double episode. It was also possible that there where 2 weeks without a Naruto episode, so we had to wait 3 weeks
