Back when
Future is an antonym for back when in topics: earlier, olden, in the past, previously in time or order.
Future
Future adjective - Of a time after the present.
Both terms in one sentence
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Back when he was in high school, Kotetsu from Tiger & Bunny spent quite a bit of effort on thinking of possible superhero names he would use in the future.
Source: Atrocious Alias -
Back when he was first introduced to the show as Lucy's future husband, fics doing this with Kevin Kinkirk of 7th Heaven were a dime a dozen.
Source: Ron the Death Eater -
He even says that, back when he was a Psycho for Hire Big Bad, he brought Kurama along as a partner to avoid gaining his ire in the future.
Source: Beware The Nice Ones / Anime
Cite this Source
Future and Back when. (2016). Retrieved 2026, August 14, from https://thesaurus.plus/related/back_when/future
Back when & Future. N.p., 2016. Web. 14 Aug. 2026. <https://thesaurus.plus/related/back_when/future>.
Future or Back when. 2016. Accessed August 14, 2026. https://thesaurus.plus/related/back_when/future.
Google Ngram Viewer shows how "back when" and "future" have occurred on timeline