StoryDragon quoted The Beautiful Decay by Veo Corva
Something strange is happening in sleepy subterranean Tombtown. Necromancers are disappearing. The crypt is changing. …
'Usther is a child,' Kylath said. 'I'm twenty-seven years old,' Usther said. 'I haven't been a child for a long time now.'
— The Beautiful Decay by Veo Corva (Page 329)
Yeah, relatively young is absolutely not the same as 'a child'...