Racing age groups

GenderAge @ 31/12Age GroupCat
M3535-39M1
M4040-44M2
M4545-49M3
M5050-54M4
M5555-59M5
M6060-64M6
M6565-69M7
M7070-74M8
M7575-79M9
M8080+80+
F3030-34F1
F3535-39F2
F4040-44F3
F4545-49F4
F5050-54F5
F5555-59F6
F6060-64F7
F6565-69F8
F7070-74F9
F7575-79F10
F8080+80+