Hope this helps:
The way I read it, there are provisions for the 18-21 crowd to carry concealed, but not open. My girlfriend is18 and a part of the empty holster brigade.She fully intends to make use of RCW 9.41.050 (8). Take a look at that one, it's the only useful one I see besides "place of abode" and "real property" underyour control.
"The applicant's constitutional right to bear arms shall not be denied, unless:
(c) He or she is under twenty-one years of age;"
[/b]Unless an exception under RCW 9.41.042, 9.41.050, or 9.41.060 applies, a person at least eighteen years of age, but less than twenty-one years of age, may possess a pistol only:
(1) In the person's place of abode;
(2) At the person's fixed place of business; or
(3) On real property under his or her control.
The provisions of RCW 9.41.050 shall not apply to:
(1) Marshals, sheriffs, prison or jail wardens or their deputies, or other law enforcement officers of this state or another state;
(2) Members of the armed forces of the United States or of the national guard or organized reserves, when on duty;
(3) Officers or employees of the United States duly authorized to carry a concealed pistol;
(4) Any person engaged in the business of manufacturing, repairing, or dealing in firearms, or the agent or representative of the person, if possessing, using, or carrying a pistol in the usual or ordinary course of the business;
(5) Regularly enrolled members of any organization duly authorized to purchase or receive pistols from the United States or from this state;
(6) Regularly enrolled members of clubs organized for the purpose of target shooting, when those members are at or are going to or from their places of target practice;
(7) Regularly enrolled members of clubs organized for the purpose of modern and antique firearm collecting, when those members are at or are going to or from their collector's gun shows and exhibits;
(8) Any person engaging in a lawful outdoor recreational activity such as hunting, fishing, camping, hiking, or horseback riding, only if, considering all of the attendant circumstances, including but not limited to whether the person has a valid hunting or fishing license, it is reasonable to conclude that the person is participating in lawful outdoor activities or is traveling to or from a legitimate outdoor recreation area;
(9) Any person while carrying a pistol unloaded and in a closed opaque case or secure wrapper; or
(10) Law enforcement officers retired for service or physical disabilities, except for those law enforcement officers retired because of mental or stress-related disabilities. This subsection applies only to a retired officer who has: (a) Obtained documentation from a law enforcement agency within Washington state from which he or she retired that is signed by the agency's chief law enforcement officer and that states that the retired officer was retired for service or physical disability; and (b) not been convicted or found not guilty by reason of insanity of a crime making him or her ineligible for a concealed pistol license.
If you have any specific questions, just ask. Reading the law is no small task.