iäkkäässä
The Finnish word "iäkkäässä" is the inessive case of the adjective "iäkäs". It translates to "in old" or "in advanced age". The root word "iäkäs" describes someone who is elderly, old, or of advanced years. "Iäkkäässä" is therefore used to indicate a state or location related to being old.
For example, one might say "iäkkäässä iässä" which means "at an advanced age" or "in old age".