If a minor commits a crime and is not tried until after 18 years old.. are they tried as a minor?

Yes. The intent at the time of the crime, the state of mind and criminal intent at that time, are relevant.

That depends on many factors. Age when crime committed, what the crime is, etc.

no, i think they would be tried as an adult because some minors under the age of 18 are even tried as adults..

the person then would be tried as an adult for the criminal complaint. The only reason to await charge would be if the minor had problems affecting their mental capability and were in for example a behavioral institution. I would think then the charge had been met in the imitational time served.

It depends on the law where the crime was committed and the crime.

Law and Regulation Questions 

Laws are different depending on where you live. When asking questions about law, you need to state the applicable city, county, state, and/or country. If a regulation you may need to give program name. 

Please update your question and not in a comment to my answer, so others will see it. 

Criminal prosecutions and sentences depend on many things. The location of the action, your age, the charges pursued by the prosecutor, the laws applicable and penalties prescribed in the law in your location, the judge involved, the defense attorney, the amount of discretion the judge has, etc. In many cases people can’t begin to guess an outcome unless they know really specific details.