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Following the new IOA/NIOA guidelines, these are the
Individual Championship Classes:

M10, M12, M14, M16A, M18A, M20A, M21E, M35L, M40L, M45L, M50L, M55L, M60L, M65L, M70, M75, M80
W10, W12, W14, W16A, W18A, W20A, W21E, W35L, W40L, W45L, W50L, W55L, W60L, W65L, W70, W75, W80

There are some other short classes available, but they are not championship classes.

Please study the Irish & Northern Irish Orienteering Associations’ relay team formation rules.