At age 20
So warfare can be considered part of their life.
Spartans
Spartan boys were sent off to a boarding school called the agoge at the age of 7.
Spartan boys were taken from their mothers at the age of seven, to be trained for fighting. As they aged, they progressed. When they were eleven they got stuck with 14 other boys. The bravest became captain, and controled the other 14.
From 12-20
When the Spartans needed to expand they went and fought against other city-states. The Spartans had a great military, so this was very easy for them to do. Some information about the spartan military.... Boys started training at the age of 7. They slept on reeds and worked all day. At the age of 18, they went into the regular military. It is also important to know that the boys were taken away from their families at the age of 7. About the girls........ The girl Spartans were trained to javalin thow, and even wrestling. Unlike Athens, the girls did not stay home. They were very active, much like the boys.
When a child is born, Spartans check if it is a healthy baby. If it is not, the baby gets thrown off a cliff or put somewhere so it can die. Spartans wanted only the strongest and healthiest people to represent them. Later, a boy at age seven is sent to military school, to train. Boys battle against boys to see who can become a warrior. When a Warrior turns 20, they can officially start their military career.
18-20 years
Super Saiyans came to earth and realized they were they most awesome warriors. their scanners detected power over 9000. the Spartans killed all the Saiyans because they saiyans were too arrogant
age 20
They would be chosen at birth if there would live or not based on if they looked strong. At age 7 there were taken from their families.