"Players who are league age 4-7 are eligible to be selected to a Tee Ball team.
Players who are league age 6 that have participated for one regular season in the Tee Ball Division are eligible to be selected to a Minor League Division (coach pitch or machine pitch) team.
Players who are league age 7-12 are eligible to be selected to a Minor League Division team (player pitch, coach pitch, or machine pitch) for the regular season. The local league board of directors may decide the age-cutoffs within this age grouping.
Players who are league age 9-12 are eligible to be selected to a Little League (“Major”) Division team for the regular season. The local league board of directors may restrict this division to players who are league age 10-12 or 11-12.
Players who are league age 12-14 are eligible to be selected to a Junior League Division team for the regular season. The local league board of directors may decide to have a different age-cutoff for this division, provided it is within the grouping noted. For example, the Junior Division in a local Little League could be limited to players who are league age 13-14.
Players who are league age 13-16 are eligible to be selected to a Senior League Division team for the regular season. The local league board of directors (or district administrator, if the program is operated by the district) may decide to have a different age-cutoff for this division, provided it is within the grouping noted. For example, the Senior Division in a local Little League could be limited to players who are league age 15-16.
Those who are not included among the league ages listed above are not eligible for any softball division in Little League for the current season."
I got the bullet list from: http://www.littleleague.org/leagueofficers/Determine_League_Age/League_Age_Calculator.htm All credit goes to them for the amazing facts about Softball.
