RIP. . how old is knuckles the echidna ALL IMAGES SHOP PING NEWS how long do achillies HUB ALL IMAGES NEWS Echidna t Lifespan 16 years. Rip in Peace RIP how old is knuckles the echidna ALL IMAGES SHOP PING NEWS long do achillies HUB Echidna t Lifespan 16 years Rip in Peace