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Phrase(s): It is never too late to learn. [and] You are never too old to learn.
Prov. You can always learn something new. • Alan: Help me make the salad dressing. Jane: But I don’t know anything about making salad dressing. Alan: You are never too old to learn. • Grandma decided to take a course in using computers. "It’s never too late to learn," she said.
McGrawhill's American Idioms And Phrasal Verbs