In re Gault (1967) was a landmark Supreme Court Case that dealt with how due process applies to children when they are accused of a crime.
This case centered around Jerry Gault, a 15-year-old boy from Arizona. It was decided by the Supreme Court that children do have the right to due process.
Because of the In re Gault case, minors have the right to due process, which includes privileges such as the right to timely notice of criminal charges, the right to an attorney, the right to not testify against oneself, the right to cross-examine witnesses, etc. So, in America, it no longer matters what a person's age is when they commit a crime; they will have the rights of due process no matter what.