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.
The age of consent varies widely from jurisdiction to jurisdiction, though most jurisdictions in the world today have an age of consent between 14 to 18 years, but ages as young as 12 and as old as 21 also occur. The relevant age may also vary by the type of sexual act or the gender of the people concerned.