The Age Determination Date for a Little League baseball player is the actual age of a child as of August 31 of the current year. (Note: The Age Determination Date for a Little League softball player is the actual age of a child as of December 31 of the previous year.) These respective dates identify the “league age” as it relates to a player’s eligibility to participate in any of Little League’s divisions of play.
For example, if your Little League baseball player was born on 2/23/2013, he is "league age 10" for the Spring 2023 season.
See this age calculator on the official Little League website for additional assistance in determining the league age of your child.