Hail, Lord Dires.
Our sages are pleased to announce that there is in fact a method to have thy lordlings come of age in a particular village.
Simply announce to the world that the village in which thou does desire these new generals emerge is now thy capital.
For many nations, the new warlords growing facial hair for the first time seem to announce their presence in the capital, wherever it may be. Others simply appear in the retinues of their fathers, should they be in the field.
We hope these scribblings aid thee.