Master Dungeon Being Start Age Best
I won't name a number. Because numbers are irrelevant. Dungeon Mastering is a matter of consistency, creativity, and reasoning. While older people are somewhat more likely to have developed some of those qualities, I've known forty year olds who would make worse Dungeon Masters than my 7 year old nephew.
Edited: daishain on 17th Dec, 2017 - 6:40pm