Where does “ikääntyminen” come from?

ikääntyminen (Finnish) comes from Finnish ikääntyä, from Finnish -Vntua, from Finnish -untua, from Finnish -ntua, from Finnish -ua, from Proto-Finnic -üdäk — Forms mainly passive or anticausative verbs.

Ancestry of “ikääntyminen”, step by step

StepLanguageWordMeaning
1FinnishikääntyäTo age
2Finnish-VntuaForms passive verbs
3Finnish-untua—
4Finnish-ntuaForms reflexive or inchoative intransitive verbs
5Finnish-uaForms stative or inchoative intransitive verbs...
6Proto-Finnic-üdäkForms mainly passive or anticausative verbs
Every word from Proto-Finnic -üdäk →Every word from Finnish -ua →Every word from Finnish -Vntua →