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.
To give just a few examples of the heterosexual age of consent: If you are living in some parts of the United States, or in Egypt, it's 18; in Northern Ireland, it's 17; in Namibia, 16; in Sweden, 15; in Canada, 14; in Korea, 13; in Mexico, 12. But 16 is by far the most common age of consent.