octogenarian

/ˌɒktəd‍ʒənˈe‍əɹi‍ən/

/ˌɑktədʒɪˈnɛɹiən/

Octogenarian

someone whose age is in the eighties

octogenarian

being from 80 to 89 years old

Examples

1. But anyway, this octogenarian had embarrassed the assembled economists of the LSE.

2. The octogenarian Twinkie is no different.

3. This one is one of my favorites, a fertile octogenarian.

4. The octogenarian couple have made it their mission to go to every Cracker Barrel in America.