Where does “quadragenarian” come from?

quadragenarian (English) comes from French quadragénaire, from Latin quadragenarius, from Latin quadrāgēnus, from Latin -ārius, from Proto-Italic *-āzios — Forms relational adjectives to nouns (and rarely numerals).

quadragenarian (English): between the ages of 40 and 49; in one's fifth...

Definitions

  1. between the ages of 40 and 49; in one's fifth...

Ancestry of “quadragenarian”, step by step

StepLanguageWordMeaning
1Frenchquadragénaireaged between forty and forty-nine
2Latinquadragenariusnumber forty; forty-year-old
3Latinquadrāgēnusforty each; forty at a time
4Latin-āriuser
5Proto-Italic*-āziosForms relational adjectives to nouns (and rarely numerals)
Every word from Proto-Italic *-āziosEvery word from Latin -āriusEvery word from Latin quadrāgēnus