What is the minimum age to join the army in your nation?

[StarArmy]

In the Star Army of Yamatai, some of our soldiers are clones that join just after birth. After a year of training, they are deployed around the time they become 1 year old.

[Makaar]

In Makaar, the minimum age to join any of the armed forces is 18, except the Royal Guard which takes only those over the age of 21 (though Army transferees with a strong record may be accepted at 19 years and 6 months provided they have served 18 months in the Army).

[Europe and Asia]

The lowest legal joining age is 17.5. You are eligible for conscription when you reach 20 Years Old.

[Afalia]

You can join from 19 years. You can only be sent into battle once you reach 20.

[Atlantae]

3 years old.
The Yezdrig, clones who make up the majority of our organic soldiers, finish training at that age.
There is no retirement age for Yezdrig. They will only retire once all their blood has left their body.

[The most holy electric empire]

The minimum age to join the military is 18 years old, 22 years old for specialist officers (since they have to get a college degree before joining as one)

[Saigonias]

18 we don't want any child to risk their life on the battlefield out there

[Arrentine]

14 to enter Army Cadets, Sea Cadets or Air Cadets. They're sort of reserve, only called in if absolutely necessary. They also have four years compulsory service in the military, versus the normal two years.

18 to join the actual armed forces.

[Cameroi]

there are no minimum nor maximum ages. there is also no army.

[Rakktor]

You are conscripted at birth. Your blood is already owned by the millitary, because your parents and their parents had their gene therapy, their AI symbiote, their physiopharmacutical, mechanical, nanotechnological, and surgical augumentations. And it's been carried over. Every generation, improved, modified. Oh, sure, you don't enter service until 18, but you'll be training your whole life.

[Norcroft]

If you belong to a Noble family that's heritage is with the Army, you are born into it and are trained and taught how to fight and kill until the age of 21, where you "graduate" and begin service.

For commoners, they can sign up at 16 with the written consent of their parents or join at the age of 21. If war is going on, the monarchy has the right to conscript the eldest son or daughter of any house that are 21 or older granted that family has at least one other offspring or the person being conscripted is married and has a child.

[Arcadiana]

16 for Militia Force, 18 for the Regular and Reserve Force. Mandatory retirement is 65

[The Eight Republics]

16 to volunteer, 18 to be eligible for conscription.

[Sardakhar]

In Sardakhar, people can join the army, either voluntarily or by conscription, when they reach the age of 12. They are immediately eligible for active service.

[The Whaltrean District]

In the Federation of the Whaltrean District, you must be male, and it's 13. If you're female, it's 16. Those that are homeless are immediately drafted into the military.
Although, actual conscription starts once you reach the age of 18, and you have to serve 4 years of compulsory service. Whether it be in the military, or in self-defence training.

[Lamplight Caverns]

In order to be able to join any Scavenger Team, you have to be at least eight years old. But carrying a gun is allowed at any age.

[Raziac]

Seven.

[Katathria]

17

[Perlis Baru]

The minimum age is 20. However, there's a "don't ask, don't tell" for homosexuals or bisexuals.

[Desperauex]

16 with guardians permission
over 45 if college graduate
18-45 otherwise

[Auzkhia]

17.

[Capitalist America]

18.

[King George Washington]

18 oldest is 50

[Knowledge Tree of Liberty]

In Knowledge Tree of Liberty at twelve you are forced to join the military unless disabled, you must serve until you die

[Avaerilon]

The minimum age one can join is 21, with mandatory retirement at 60.