Where does “sześćdziesięcioletni” come from?

sześćdziesięcioletni (Polish) comes from Polish letni, from Polish lato, from Proto-Slavic lěto, from Proto-Indo-European leh₁tóm.

sześćdziesięcioletni (Polish): sixty-year-old, sixty-year-long

Definitions

  1. sixty-year-old, sixty-year-long

Ancestry of “sześćdziesięcioletni”, step by step

sześćdziesięcioletni traces back through two separate lines of ancestry.

via Polish letni

StepLanguageWordMeaning
1Polishletnisummer, summery, estival
2Polishlatosummer
3Proto-Slaviclětosummer; year
4Proto-Indo-Europeanleh₁tóm—

via Polish sześćdziesiąt

StepLanguageWordMeaning
1Polishsześćdziesiątsixty
2Old Polishsześćdziesiątsixty
3Proto-Slavic*šestь desęti—
Every word from Proto-Indo-European leh₁tóm →Every word from Proto-Slavic lěto →Every word from Polish lato →