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Per https://en.wikipedia.org/wiki/Timeline_of_Reddit#Full_timeline https://en.wikipedia.org/wiki/Timeline_of_Reddit#Full_timeli..., the site launched in 2005, a
by mikepurvis 7y ago
Per https://en.wikipedia.org/wiki/Timeline_of_Reddit#Full_timeline https://en.wikipedia.org/wiki/Timeline_of_Reddit#Full_timeli..., the site launched in 2005, and from pretty early on there were a handful of centrally-managed ones like science, programming, etc, with the option to create arbitrary ones coming in 2008.
So technically "years", but those were the very early days.