Board Thread:Naruto Discussions/@comment-25075327-20140618023513/@comment-18497248-20140618030051

Omnibender wrote: Sage is much older than 500, as Shima and Fukasaku, who are about 800 years, thought the Sage was a myth.

Don't forget that he knows/knew the Old Toad Sage, who is at least 1,000.