In use
In use adjective - Currently being used.
Old
Old adjective - Being of advanced years and especially past middle age.
Both terms in one sentence
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That is why they decided that an old Klingon ship that hadn't been seen since the first movie was still in use, it gave the fleet more variety.
Source: Off-the-Shelf FX -
This is an old trope - dating back at least as far as the Dance of Death depictions of the late Middle Ages - and still in use in the 21st century.
Source: Skeletal Musician - The modern definition of "making love" was in use when Billy Joel's "Piano Man", but the song contains an straight example of the original meaning: "There's an old man sitting next to me / Making love to his tonic and gin."
Source: Have A Gay Old Time / Music
Cite this Source
Old and In use. (2016). Retrieved 2026, August 16, from https://thesaurus.plus/related/in_use/old
In use & Old. N.p., 2016. Web. 16 Aug. 2026. <https://thesaurus.plus/related/in_use/old>.
Old or In use. 2016. Accessed August 16, 2026. https://thesaurus.plus/related/in_use/old.
Google Ngram Viewer shows how "in use" and "old" have occurred on timeline