Have (grown) whiskers informal verb phrase
Used to describe something that is extremely old to talk about or to do, especially a joke or a story.
The writer constructed a complicated plot based on fairy tales which have grown whiskers.
It is not funny at all. Your joke has grown whiskers. I've heard it so many times.
To be in a poor condition.
Another individual is far older than the individual in question
Said when a person is in a romantic or sexual relationship with another younger person
Look older than a certain age
The verb “have" should be conjugated according to its tense.