Age of Consent refers to the age at which a minor can consent to a sexual relationship. Different countries have different laws. Some go as low as 9 (for females) to as high as 25 (for both sexes)....
They will be in just as much trouble. Rape is Rape no matter who you are.
It's eighteen.
The age of consent is 16. People under that age may have sex with people who have an age difference of LESS than 4 years, for instance 15-13.
It's sixteen.