Did Athens or Sparta have there Boys leave home at age seven to attend school and get training?

Sparta. At just seven years old, boys would be stripped away from their families and plunged into training. In this brutal training, boys were taught to be ruthless killers and soldiers of war. One of the most merciless drills was at the end of their training; they were to sneak away from their quarters to strangle and kill a slave. The trick was that they could not get caught in the act. No matter the cause for it, they were harshly punished for the action. The reason for this rule it that they have been taught not to get caught. They have been trained for being stealthy in spying and if they are caught, then they are considered not fit.