I’m not sure if I would go as far as gp to claim older, but statusnet and ostatus which were early parts of the fediverse date from within a couple years of facebook’s general availability. I would say the fediverse about as old as Facebook (2008 vs 2006, close enough?)
That makes sense considering that before this update, posts weren’t searchable so you could only find user profiles, hashtags, and your own (& favorited?) posts. It was basically just a hashtag and user search before.