1. a person who is between 80 and 89 years old

1. being between 80 and 89 years old

Examples

• The octogenarian still drives to the grocery store every week.
• My octogenarian grandmother celebrated her 85th birthday yesterday.
• The library hosts a book club for octogenarian readers.
• He remained active and healthy as an octogenarian.
• The octogenarian couple has been married for sixty years.
• She became an octogenarian author, publishing her first novel at age 82.