n. a lesser crime punishable by a fine and/or county jail time for up to one year. Misdemeanors are distinguished from felonies which can be punished by a state prison term. They are tried in the lowest local court such as municipal, police or justice courts.isdemeanor. Offenses lower than felonies and generally those punishable by fine, penalty, Forfeiture, or imprisonment other than in a penitentiary. Under federal law, and most state laws, any offense other than a felony is classified as a misdemeanor.
The time skip for Naruto Shippuden (if we are going by the manga) is three years, which makes Naruto 16 at the start of Shippuden. Likewise, it can be argued that Naruto turned 17 at some point in Shippuden considering how long it went, but it's just conjecture.
In Naruto, the first half of the anime series that includes Naruto and Naruto Shippuden, Itachi Uchiha was 18. In Naruto Shippuden, he was 20 to 21. Official sources back this up. Itachi Uchiha.