Yuukyuu no Gusha Asley no, Kenja no Susume Manga

After failing at the Magic Academy as a young man, Asley is looked down on by those around him. By chance, he discovers a legendary potion that grants him an immortal body, and turns to studying magic and supernatural artifacts outside the academy’s teachings in search of revenge. Five thousand years of research pass, and he becomes an aged magic user without realizing how much time has gone by. The people he once sought revenge on are long dead, leaving Asley without a purpose. He sets out to see the world with his familiar, Pochi, and, after helping many people along the way, ends up living at a magic institute. Though he is five thousand years old, Asley still looks young and now faces a second life in which he can experience youth again.