forty-something

the compound "forty-something" is a modern english formation, following the pattern of number + "-something" to denote an approximate age. the first element, "forty," originates from old english feowertig, a compound itself of feower (four) and tig (group of ten), reflecting the base-ten counting system. the second element, "something," from old english sum þing, meaning "an unspecified thing or amount," provides the sense of indefiniteness. this pattern, emerging in the late 20th century, efficiently creates a colloquial term for a person in their fifth decade of life, blending precise numerical reference with deliberate vagueness.

Structure: forty (number) + something (indefinite pronoun) forty: from old english feowertig, meaning "four tens" or the number 40. functions as the cardinal number in the compound. something: from old english sum þing, meaning "some thing" or an unspecified thing. functions as an indefinite pronoun indicating an approximate or unspecified amount.