Examples:

• You're a little long in the tooth, aren't you?
• I'm not that long in the tooth, but thank you, I'm flattered.
• Well, he's getting a little long in the tooth.
• We're both getting long in the tooth.
• They seem a little long in the tooth.
• Well, she was a little long in the tooth to be necking in her car.
• You just got a little too long in the tooth.
• We're getting a little long in the tooth for this kind of thing, Tom.
• Bit long in the tooth for this kind of job, aren't you, Commander?
• I'm not that long in the tooth, but thank you, I'm flattered.