She was his youthful mistake: she is in the past tense.

He called the prison time stemming from activities in his mid-20's a "youthful mistake."

Show what a good little homebody she really is, her youthful mistakes notwithstanding.

But the Astros should be interesting as they learn to overcome their youthful mistakes.

She's not ready for commitment, she's making her youthful mistakes, and you're just one of them.

Bush admitted to youthful mistakes but indicated that he has been drug-free for at least 25 years.

It was another example of young players making youthful mistakes.

Big plays that compensate for his team's weaknesses, its youthful mistakes.

The game displayed both American skill and youthful mistakes: what this team is about.

A youthful mistake from which you were unable to extricate yourself?