"Younger" or "youngest" - English Language & Usage Stack Exchange
https://english.stackexchange.com/questions/54478/younger-or-youngest
WEBJan 12, 2012 · To me, younger is preferable to youngest, not least because it seems an odd choice to define 2/3 of a group with a superlative. The oldest child is the only one who isn't younger than any other child -- thus, younger children is quite clear.
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