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along in years

along in years idiom

Also, on in years. Elderly, old. For example, Grandma's along in years now and doesn't hear too well, or Our dog is not as frisky now that he's getting on in years. This idiom transfers the length of along (and the “onward” of on) to the passage of time. [Late 1800s]

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.