The average age for a Sgt(E-5) in the US Army is 22 with 4.5 years in. They have roughly the same level of authority as a MCpl. If your system is robust, you can get away with it because they should be supported from above. The problem I see is a) our system is weak and getting weaker, b) our junior leaders (MCpl/Lts) are being properly supported, and c) we don't apply the same rules to everyone and the ones that get away with the most are often the same people picked to be succession planned.Actually, any unit in the CAF enters the chat.
G2G raised the very good point of a 22 year old MCpl leading a section of 18 -19 year old privates.
children leading children?