PCAA follows the Cal Ripken / Babe Ruth age chart to determine "League Age" 

May 1 serves as the beginning of each new 'year'. A player's age on April 30th of the calendar year establishes their 'League Age' age for that year.

Example: A child born on April 6th, 2019 would have a 'league age' of 4 for all competitions in calendar year 2023. A child born May 1st 2019 would have a 'league age' of 3 for all competitions in calendar year 2023.

The official age chart is available here:
AGE CHART