There are no 64 shops open only medical shops that is until this fall 2013... we hope. That is when the regulations are supposed to be finished and licenses distributed anyway. Medical shops are supposed to have first dibs so you might just see dispensaries go recreational which will make the availability of recreational buds come much quicker. Oh and yes anyone over 21 can buy cannabis from a shop once they open
Right now though, anyone over 21 can grow 6 plants and can have all they harvest stored at their house, but only travel with one ounce.