Quite. I have read a handful of memoirs written by persons around 30, and the ones that impressed me were memoirs of military service: Goodbye to All That by R

Quite. I have read a handful of memoirs written by persons around 30, and the ones that impressed me were memoirs of military service: Goodbye to All That by Robert Graves (yes, evidently he got various details wrong), The Killing Zone by Frederick Downs, etc. But in general I'd rather the memoirist have fifty years under his or her belt.