Aetatis suae, meaning "of his/her age," appears on monuments and gravestones to specify age at death. In poetry, this formulaic phrase evokes epitaphic tradition, mortality's accounting, and the reduction of a life to numerical fact. Poets employ it when adopting epitaphic modes, when condensing biography to essential data, or when meditating on how lives are remembered and summarized. The phrase suggests both the dignity of memorial inscription and the inadequacy of such brevity. It appears in elegiac verse and poems exploring commemoration, where the speaker recognizes that epitaphs simultaneously honor and limit the dead, preserving memory while reducing complex lives to stone and formula.

Aetatis suae appears on Roman monuments and continues in modern epitaphs, recording age at death. The formula reduces a life to biographical fact—name, dates, age—raising questions about what such brevity conceals. Poets adopt epitaphic conventions to explore how lives are summarized and remembered. The phrase connects to the memento mori tradition and questions about legacy: what remains after we're reduced to inscription? Related to other epitaphic formulas like hic jacet (here lies) and requiescat in pace (rest in peace). Useful for understanding how poets work within or against conventional memorial forms. The phrase also appears in poems about aging, where speakers track their own aetatis suae count, marking time's passage with increasing urgency as the final number approaches.