Assumption

The woman was about to bring out an artifact when Alex spoke up. "There's no need for that. I can tell an oath to confirm my age," he said.

The woman looked at the white-haired old man who smiled at Alex.

"Very well," the old man said. "Speak your oath. Since you say here that you are about 2 thousand years old, make an oath that you are older than 1500 years of age."

Alex was about to say the oath when his ears registered what the old man wanted him to say. "I'm sorry?" he asked.

"Go on," the old man said. "Confirm that you are older than 1500 years of age."

Alex hesitated a bit, confused about the situation. How was he supposed to make that oath? He couldn't. The examiners were seeing right through him.

"I…"

"What about a thousand?" the middle-aged man asked. "Can you say that oath?"