Definitions

1. adjective

Lacking the characteristics or qualities of youth; old, aged, or mature.

“The unyouthful politician’s stern demeanor deterred many young voters from supporting him.”

2. noun

A person who is old or mature, often in a way that is considered unimpressive or lacking the qualities of youth.

“The unyouthful appearance of the elderly man in the movie made it difficult to believe he was once a successful actor.”