Where does “шестидесятилетний” come from?

шестидесятилетний (Russian) comes from Russian шестьдесят, from Russian шесть, from Old East Slavic шесть, from Proto-Slavic šestь, from Proto-Balto-Slavic šéš, from Proto-Indo-European swéḱs — six.

шестидесятилетний (Russian): sixty-year

Definitions

  1. sixty-year

Ancestry of “шестидесятилетний”, step by step

шестидесятилетний traces back through two separate lines of ancestry.

via Russian шестьдесят

StepLanguageWordMeaning
1Russianшестьдесятsixty (60)
2Russianшестьsix
3Old East Slavicшестьsix
4Proto-Slavicšestьsix
5Proto-Balto-Slavicšéšsix
6Proto-Indo-Europeanswéḱssix

via Russian ле́то

StepLanguageWordMeaning
1Russianле́тоyear; summer, year
2Old East Slavicлѣтоtime
3Proto-Slaviclětosummer; year
4Proto-Indo-Europeanleh₁tóm
Every word from Proto-Indo-European swéḱsEvery word from Proto-Balto-Slavic šéšEvery word from Proto-Slavic šestь
шестидесятилетний — Etymology, Origin & Word History | Etymology Explorer