Your player’s league age is determined by the Little League Baseball® and Little League Softball® age charts. The dates for baseball and softball are different, but each determines the division in which your Little Leaguer will play this season. The Age Determination Date for a Little League Baseball player is the actual age of a child on August 31 of the current year. The Age Determination Date for a Little League Softball player is the actual age of a child on December 31 of the previous year.
You can find the official little league age calculator here:
https://www.littleleague.org/play-little-league/determine-league-age/Click one of the links below to help you determine what division your child are eligible for: