Sunzo is the Steward of Warrior’s Temple, and the only person in the world known to be able to use Life abilities. As such, he is far older than he appears, owing his youthful appearance to having Life energy flowing through him. He has spent most of his adult life in Warrior’s Temple, assisting Master Rohk with both assisting with the new disciple’s affinity tests, as well as daily work and teaching at the Temple. He never speaks of his past to anyone.
Saam gives Teo a bit of explanation.