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had been aging

  • past perfect progressive
    of age.
    age
    noun
    the length of time during which a being or thing has existed; length of life or existence to the time spoken of or referred to.

Example Sentences

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The two Muslims had Baklava made with Texas Pecans and honey that had been aging for a month with bit of orange zest immersed in it.

From New York Times Apr. 10, 2018

Her mind had been aging rapidly in those long periods of unbroken reflection.

From Susan Lenox: Her Fall and Rise by David Graham Phillips