Do the monks tattoo Aang once he is an airbender অথবা something???

The airbender ট্যাটু are প্রদত্ত once they have achieved mastery. Which means mastering all 38 forms and creating a সরানো of your own. In Aang's case his "signature" সরানো is the airball scooter.
Aang is the youngest one to ever have gotten the tattoos.

YEAH WHAT SHE SAID