The national league
"Senior League" refers to the youth league after "Little League" but before High School. Senior League players are usually between the ages of 13-15 and/or grades 7-9. Most Senior Leagues allow bats larger than the 2.25" Little League approved bat diameter, and bats can be lighter than the High School -3 minimum weight/length, but the bat weight ratio limits vary with the specific senior league organization. For example, Catholic Youth Athletic Association limits grade 7-8 bats to -7 weight ratio (no lighter). So, be careful when shopping for a "Senior League" bat as the rules for different organizations are less consistent than they are for the 9-12 year olds that usually follow Little League rules.
BFA Senior League was created in 1990.
Leicestershire Senior League was created in 1896.
South Wales Senior League was created in 1991.
National Senior Classical League was created in 1960.
Staffordshire County Senior League was created in 2005.
Essex Senior Football League was created in 1971.
Gloucestershire Northern Senior League was created in 1922.
Carillon Senior Hockey League was created in 2003.
Hertfordshire Senior County League was created in 1898.
the best senior league bat the 2010 Anderson nanotek XS
Avalon East Senior Hockey League was created in 1991.
Newfoundland Senior Hockey League was created on 2011-09-10.