Palaikian

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Palaikian describes a maturity level for headmates that is ancient, infinite, or eternal in some way. This is meant as a maturity that is experienced by nonhuman members whose species is immortal or can otherwise reach very high ages.

A palaikian headmate may behave in a calm, serene, or even omniscient manner due to their age, or they may act almost child-like due to a shift in priorities that may come with immortality.

Related Terms
Other maturity-based age descriptors are thilikian, anatrikian, neanikian, and enilikian.

History
The term comes from the greek "palaios" for ancient, and "ilikia" for age.