long in the tooth

Idioms  

1. Getting on in years, old, as in Aunt Aggie's a little long in the tooth to be helping us move. This expression alludes to a horse's gums receding with age and making the teeth appear longer. [Mid-1800s]

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Example Sentences

Writing after Lawson's appointment was rumoured last week, the Guardian's Stuart Heritage said that The Great British Bake Off has "lost its way" and "become slightly long in the tooth over the last half decade or so".

From BBC

Plenty of analysts have pointed out that this bull market is getting long in the tooth.

From Barron's

The artificial-intelligence trade, which has experienced volatility in recent weeks, “is getting a little long in the tooth,” Goldberg told MarketWatch.

From MarketWatch

The artificial-intelligence trade, which has experienced volatility in recent weeks, “is getting a little long in the tooth,” Goldberg told MarketWatch.

From MarketWatch

The peak External link year was 2021, meaning those computers are now getting long in the tooth.

From Barron's