age eighty; one's eighties
Refers to the age of eighty or the decade of one's eighties. Often used in contexts like birthdays, longevity celebrations, or describing someone's age.
My grandmother will turn eighty this year.
Even in his eighties, he continues to take a walk every day.
八十 (eighty) + 路 (suffix indicating a decade of age). The suffix 路 is used in words like 四十路 (forties), 五十路 (fifties), etc., to denote a range of ages.