Where does “sedmdesátník” come from?

sedmdesátník (Czech) comes from Czech sedmdesát, from Czech deset, from Old Czech desět, from Proto-Slavic desętь, from Proto-Balto-Slavic *déśimt, from Proto-Indo-European déḱm̥t — ten.

sedmdesátník (Czech): septuagenarian

Definitions

  1. septuagenarian

Ancestry of “sedmdesátník”, step by step

StepLanguageWordMeaning
1Czechsedmdesátseventy
2Czechdesetten
3Old Czechdesětten
4Proto-Slavicdesętьten
5Proto-Balto-Slavic*déśimtten
6Proto-Indo-Europeandéḱm̥tten
Every word from Proto-Indo-European déḱm̥t →Every word from Proto-Balto-Slavic *déśimt →Every word from Proto-Slavic desętь →