Etymology
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aet. 

"aged (some number of years)," abbreviation of Latin aetatis "of the age of," genitive singular of aetas "age" (see age (n.)). "Chiefly used in classic or scholarly epitaphs or obituaries" [Century Dictionary].

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senility (n.)

"old age, especially the weakness or imbecility due to old age," 1753, from senile + -ity.

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eld (n.)

"former ages, old times," c. 1400, poetic or archaic form of old; in some cases from Old English eald, yldu, yldo "old age; an age; age as a period of life."

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nonage (n.)

late 14c., "childhood, minority, state of not being of age, period of legal infancy," from Anglo-French nounage (early 14c.), Old French nonaage, from non- (see non-) + age (see age (n.)). Figurative use from 1580s.

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thanage (n.)

c. 1400, from Anglo-French thaynage (c. 1300), from English thane + Old French suffix -age (see -age).

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senile (adj.)

1660s, "suited to or characteristic of old age," from French sénile (16c.), from Latin senilis "of old age," from senex (genitive senis) "old, old man" (from PIE root *sen- "old"). The meaning "infirm from age; pertaining to or proceeding from the weakness that usually attends old age" is attested by 1882; senile dementia is attested by 1851.

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oldness (n.)

"old age, decrepitude; great age, antiquity; the state of being old," Old English ealdnysse; see old + -ness.

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anecdotage (n.)

1823, "anecdotes collectively," from anecdote + -age. As a jocular coinage meaning "garrulous old age" it is recorded from 1835, and spawned anecdotard (1894).

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coeval (adj.)

"having the same age, having lived for an equal period," 1620s, from Late Latin coaevus"of the same age," from assimilated form of Latin com "with, together" (see com-) + aevum "an age" (from PIE root *aiw- "vital force, life; long life, eternity"). As a noun from c. 1600.

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