In 2014, Little League District Administrators initially voted to move the age determination date from April 30 to December 31, effective with the 2018 season. That was amended by District Administrators and the Little League International Board of Directors in August 2015, moving the date from December 31 to August 31.

For players born on or before August 31, 2005: The new age determination date of August 31 will be effective starting with the 2018 Little League Baseball Season. For the 2016 and 2017 seasons, these players will use the April 30 age determination date.

For players born on or after September 1, 2005: The new age determination date will be effective immediately, starting with the 2016 season. This was the implementation used for the 2015 season, with players turning 4 to 9 years old during the 2015 calendar year to use the December 31 age determination date. That implementation remains in place, except instead of using December 31, you will use August 31.
 
2017 Little League Age Chart
FOR BASEBALL DIVISION ONLY

Match month (top line) and box with year of birth. League age indicated at right.

JAN	FEB	MAR	APR	MAY	JUN	JUL	AUG	SEP	OCT	NOV	DEC	AGE
2013	2013	2013	2013	2013	2013	2013	2013	2012	2012	2012	2012	4
2012	2012	2012	2012	2012	2012	2012	2012	2011	2011	2011	2011	5
2011	2011	2011	2011	2011	2011	2011	2011	2010	2010	2010	2010	6
2010	2010	2010	2010	2010	2010	2010	2010	2009	2009	2009	2009	7
2009	2009	2009	2009	2009	2009	2009	2009	2008	2008	2008	2008	8
2008	2008	2008	2008	2008	2008	2008	2008	2007	2007	2007	2007	9
2007	2007	2007	2007	2007	2007	2007	2007	2006	2006	2006	2006	10
2006	2006	2006	2006	2006	2006	2006	2006	2005	2005	2005	2005	11
				2005	2005	2005	2005					11
2005	2005	2005	2005	2004	2004	2004	2004	2004	2004	2004	2004	12
2004	2004	2004	2004	2003	2003	2003	2003	2003	2003	2003	2003	13
2003	2003	2003	2003	2002	2002	2002	2002	2002	2002	2002	2002	14
2002	2002	2002	2002	2001	2001	2001	2001	2001	2001	2001	2001	15
2001	2001	2001	2001	2000	2000	2000	2000	2000	2000	2000	2000	16