Naruto: The Immortal Sage

"Just how long have you been messing around in the Shinobi world? I’ve been here since the Sage of Six Paths founded Ninshu!" I was there for the battle against Kaguya. I was still there during the clash between Indra and Asura... I have witnessed the rise and fall of eras, sitting idly by as the Shinobi world wages its endless wars. Though I rarely lift a finger, legends of my existence are etched into every corner of this world. Time is a ruthless blade that strikes down even the brightest of prodigies, but I intend to stand taller than time itself. I am the one who knows all there is to know in the Shinobi world—a true Immortal! .............................. "Let's take a look at your 'Shinobi Age'." "Oh? You've already reached a century old? My, you gave me quite a fright!" "Let me give you a baseline number, just so you can grasp the sheer caliber of the veteran standing before you..." "My age in the Shinobi World is.... 5,000 YEARS!!!" — Description from novelcodex.org