too long in the tooth

  • Long in the tooth = old. Therefore: too long in the tooth = too old
     
    I just came across this:

    Aren't I a bit long in the tooth to start being an undergraduate?

    Is "to be long in the tooth" still understood in America? I'm assuming it means "to be old".
     
    I just came across this:

    Aren't I a bit long in the tooth to start being an undergraduate?

    Is "to be long in the tooth" still understood in America? I'm assuming it means "to be old".
    It's understood by me, but I have no idea whether people who are a couple of generations younger understand it.
     
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