octogenarian

The active octogenarian still walks three miles every morning and gardens in the afternoon.

(Chinese) 这位精力充沛的八旬老人每天早晨仍步行三英里，下午还打理花园。

A group of octogenarians gathered at the community center to share stories from the war.

(Chinese) 一群八旬老人聚集在社区中心，分享战争时期的故事。