14 years old, you can apply for an ID card. There is a temporary id card specially designed for flying, which is valid for three months.
The above are domestic flights.
If you want to go abroad, you must use your passport and apply for a visa from the relevant destination country, otherwise you will not be released.
The current rule is that children who have been in good health for more than 9 months must apply for passports when entering or leaving the country.