-ikian

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-ikian is an age-related suffix that refers to the maturity level of a headmate instead of a specific age or age range. This is meant to allow comparison between headmates of species with different life spans and cycles, including animal or otherwise nonhuman headmates. It also allows grouping of members with similar maturity levels but different numeric ages due to different maturing and development.

Terms with this suffix

 * Thilikian: nursing stages, such as toddlers
 * Anatrikian: fledgeling or juvenile stages, such as (older) prepubescent children
 * Neanikian: adolescent stages, such as teenagers and young adults
 * Enilikian: adult stages, such as older adults
 * Palaikian: ancient or eternal age, usually experienced by nonhuman or even immortal headmates, with a specific associated maturity level that may be unique to the species in question

History
The term comes from the greek "ilikia" for age.