Knuckles the Echidna is canonically 16 years old in the Sonic the Hedgehog game universe
. He was originally described as 15 years old when he debuted but has generally been portrayed as 16 in official materials since Sonic Adventure and Sonic Heroes
. While some fan theories and extended lore suggest he may be centuries old due to his heritage as a guardian of the Master Emerald, the official character age in the main game continuity is 16 years old
