In the US the laws vary by state. In Kansas you must:
be 18 years or older
be a US citizen or legal alien (minor problem here)
have a high school diploma or equivalent
take a 60 hour class
pass the Kansas licensing exam
pass a background check
Kansas also has one of the easiest exams in the US. Other states are more strict and have more difficult tests. CA’s test has a pass rate of around 50%. Even the most strict only requires 135 hours of training, though.