'Interesting facts. Thanks. 14 is quite young to be appointed, I wonder if Marie Coburg was appointed at a similar tender age ?'
As I understand it, Grand Dukes and Grand Duchesses were appointed Colonels-in-chief at birth, but only started wearing uniform and attending parades etc in that role a good deal later.
Incidentally, Prussian princes were put under the tutelage of military governors at seven and commissioned into the 1st Foot Guards at ten.
Ann