For senior teams, you must be 18 or under (cannot turn 19 before August 31st). For open teams, there is no age limit.
Cheer Athletics usually has a variety of open age level teams including Wildcats, Fiercecatz, Junglecats, & Ladycatz. They don't necessarily always field all 4 of those teams however. Wildcats is a consistently fielded open level 5 coed and some years they have also had Junglecats, which was open level 6 coed (not consistently fielded). Fiercecatz and Ladycatz have both been fielded for the past 2 or so years, with Fiercecatz being open level 5 all girl, and Ladycatz being open level 6 all girl.
Their open teams are very competitive, so start working on strong technique in tumbling, stunting and jumping to achieve your dream!