young at heart

young at heart idiom
Having a youthful outlook, especially in spite of one's age. For example, She loves carnivals and fairs; she's a grandmother but she's young at heart.

The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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