At the beginning of the Han dynasty, every male commoner aged <answer>twenty</answer>-three was liable for conscription into the military. The minimum age for the military draft was reduced to <answer>twenty</answer> after Emperor Zhao's (r. 87–74 BC) reign. Conscripted soldiers underwent one year of training and one year of service as non-professional soldiers. The year of training was served in one of three branches of the armed forces: infantry, cavalry or navy. The year of active service was served either on the frontier, in a king's court or under the Minister of the Guards in the capital. A small professional (paid) standing army was stationed near the capital.
What was the lowest age a soldier could be conscripted after the end of Emperor Zhao's tenure?
twenty