This command changes the age of the heir of your current country. If you specify a country tag, the age of the heir of that country will be changed.
age_heir [age] [country tag]
| Age | A number. The age to set the heir to. |
| Country Tag | Optional. The country tag of the country's heir you wish to change the age of. If not specified, the effect of this command will be applied to the country you are playing as. |
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age_heir 12
The above command would set the age of your current country's heir to 12.
age_heir 33 POL
This command would set the age of Poland's (country tag POL) heir to 33.