All soccer clubs in the US have switched to birth year to determine what age group a player plays in. For instance a player born in the year 2005 will play in the U15 age group for the 2019-20 season. Also note that the format “U followed by age” really means that age and younger. For example, U8 should be read as 8 and younger.
There is another very important component to understand about this chart. To avoid players aging out of an age group during a season, the new top age group for youth competitions is U19. This change aligns with the birth year standard and makes sure that players are not eliminated from participating during the second half of a season.
2019-2020 Age Group Chart