Most started when they were more than 70 years old. The volunteers took one of several short training classes meant to help them keep their mental abilities.
Maester Aemon had counted more than a hundred name days, Jon knew. Frail, shrunken, wizened, and blind, it was hard to imagine him as a little boy no older than Arya.
That did not sound right to Jon, yet he said nothing. The maester was a hundred years old, and a high officer of the Night's Watch; it was not his place to contradict him.