Good idea to document determination. - Particularly if you conclude you are not subject to the rule. - Not a rule requirement. See Section 2.4 of SPCC guidance document. http://www.epa.gov/emergencies/docs/oil/spcc/guidance/2_Applicability.pdf.
The age of consent is eighteen. With parental consent, parties can marry at age seventeen with the exception that if one party does not have a parent who resides in the state and one party has been a resident in Oregon for at least six months, then no permission is necessary.
Similarly, no protections are reserved for sexual relations in which one participant is a 15 year old and the second is a 16 or 17 year old. The Age of Consent ranges state-by-state from 16 to 18 years old across the United States. Click the map to view any state's age of consent laws.