If someone’s getting long in the tooth, it means they’re getting old, or too old for their behavior. The metaphor of long teeth comes from horses. If you look at a horse’s teeth and the extent to which their gums have receded, you can tell pretty accurately how old they are. It’s the same source as that old advice, “Don’t look a gift horse in the mouth,” which means “if someone gives you a gift, don’t inspect it too closely.” This is part of a complete episode.
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