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What you are asking has no age of consent, a minor in WA in 1966 was someone under the age of 18, so you had no legal right to consent or not consent to the adoption. You cannot undo or reverse the adoption, but you can file a petition for name change to take back your birth name, your step father could not stop you from doing that now. However, the adoption I am afraid is final legal action and you as the adoptee cannot legally undo it, all you can do is change your name.
Changing your name is ***** ***** you need, because his adoption of you no longer has any legal effect on you except that you now have rights to inherit from him unless he has a will excluding you. You cannot legally undo the adoption though unless you find someone else you want to adopt you and do an adult adoption which you can consent to now and he cannot object to.