be long in the tooth
US /bi lɔŋ ɪn ðə tuθ/
UK /bi lɔŋ ɪn ðə tuθ/

1.
年紀大, 老了
to be old or too old to do something
:
•
He's a bit long in the tooth to be starting a new career.
他年紀有點大了,不適合開始新的職業生涯。
•
Some people might think I'm long in the tooth for this kind of adventure, but I don't care.
有些人可能認為我年紀太大不適合這種冒險,但我不在乎。