Long in the tooth
Meaning
To be old or past one's prime, often showing visible signs of aging.
Origin
Observe an aging horse, and you'll notice a curious phenomenon: as years pass, their gums recede, exposing more of their teeth. This makes their teeth appear longer, a natural and unmistakable indicator of advanced age in equines. Horse traders and owners have long used this physical characteristic to assess an animal's age and determine its value or usefulness. From this practical observation in the stables and fields, the phrase galloped into general usage, becoming a vivid and slightly humorous way to describe anything—or anyone—that is past its prime and showing clear signs of old age.
Examples
- The old car, though still reliable, was getting a bit long in the tooth for long road trips.
- Despite being long in the tooth, the seasoned politician still commanded respect and influence.