Band age definitions
Category (Based on Member Age)
Junior:
Bands in which all the participating band members are under 16 years of age during the competition
Senior:
Bands that do not qualify for the Junior category and whose participating band members are under 23 years of age during the competition
Open:
Bands in which any of the participating band members are over the age of 22 during the competition
Class (Based on Band Size)
A — Fewer than 65 performing members
AA — 65 to 100 performing members
AAA — 101 to 150 performing members
AAAA — Over 150 performing members