Old
Old adjective - Having been such at some previous time.
Usage example: I ran into my old fourth-grade teacher yesterday
Past is a synonym for old in bygone topic. In some cases you can use "Past" instead the word "Old" as an adjective or a noun or an adverb, when it comes to topics like time, ancient, former, precede. obsolete substitute
Past
Past adjective - Having been such at some previous time.
Usage example: a past editor of the newspaper
Mutual synonyms
Both words in one sentence
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Bookends: The film opens and closes with narrations from both the old and young Charles Xavier, respectively; the former contemplates the future while the latter reflects on the past.
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Finally, the Heart of Jupiter saga has Keima time-traveling into his past seven-year-old self to complete the checkpoints that established his present life.
Source: Manga / The World God Only Knows -
Dexter rationalizes that Brian was too old and past salvation after this.
Source: Series / Dexter
Cite this Source
Past and Old. (2016). Retrieved 2026, August 16, from https://thesaurus.plus/related/old/past
Old & Past. N.p., 2016. Web. 16 Aug. 2026. <https://thesaurus.plus/related/old/past>.
Past or Old. 2016. Accessed August 16, 2026. https://thesaurus.plus/related/old/past.
Google Ngram Viewer shows how "old" and "past" have occurred on timeline