way back when (adjective) past: olden, former
Sinonime: ages ago,
ancient, ancient history, back when, behind one, bygone, bypast, down memory lane,
earlier,
early, erstwhile, ex-, foregoing, gone-by, good old days,
late,
latter, latter-day, long-ago,
old, olden days,
once, one-time,
over,
preceding,
previous,
prior, quondam,
recent, retired, sometime, time was, way back, way back when
Antonime: current,
future,
present