Where does “sixtysomething” come from?

sixtysomething (English) comes from English something, from Middle English somþyng, from Old English sum, from Proto-West Germanic *sum, from Proto-Germanic sumaz, from Proto-Indo-European sem- — together, one.

sixtysomething (English): An indeterminate value between 60 (inclusive) and 70 (exclusive)

Definitions

  1. An indeterminate value between 60 (inclusive) and 70 (exclusive)

Ancestry of “sixtysomething”, step by step

sixtysomething traces back through two separate lines of ancestry.

via English something

StepLanguageWordMeaning
1EnglishsomethingAn uncertain or unspecified thing; one thing; A...
2Middle Englishsomþyngsomething
3Old Englishsumsome
4Proto-West Germanic*sumsome
5Proto-Germanicsumazsome (one), a certain (one)
6Proto-Indo-Europeansem-together, one

via English sixty

StepLanguageWordMeaning
1EnglishsixtyThe cardinal number occurring after fifty-nine...
2Middle Englishsixty
3Old Englishsixtiġsixty
4Proto-Germanicsehs tigiwizsixty
Every word from Proto-Indo-European sem-