He has reached his sixties and is about to retire.
Tips
usage
Traditional Chinese calendar divides each month into three periods of ten days: 上旬 (shàngxún, days 1–10), 中旬 (zhōngxún, days 11–20), and 下旬 (xiàxún, days 21–end of month). Also used for decades of age: 七旬老人 = a septuagenarian.