This makes more sense now. I didn't know that plates typically went with the car in California. Here in Illinois you can keep your registration when you change cars-as I said I've had the same registration number for over a decade now, on two different cars (the CRX and now the Miata).
Until the plate design change a couple of years ago, you could tell how old a registration number was by the letter and number combos (when they changed designs you could opt to keep your current registration number. Everyone in my family did, but many people, particularly those without vanity plates, did not). Plates that had two letters then four numbers (ie "AA 1111") were issued in the late seventies or early eighties (when the state stopped issuing new plates every year). So, that "AA 1111" would've been a fairly early issue. Once they ran out they went to three and three ("AAA 111"), and now they're pretty much random, with a pattern that seems to be "A11 1111". Mom's plates are "BG 0000" (not the real numbers), so fairly early in the issuance, although nobody can remember exactly when we got that registration number- but we used to have two, one number apart ("BG 0000" and "BG 0001") because my parents applied for the plates for two cars at the same time. One of them was lost when my sister got the car it was attached to, then traded it on a new one. For some reason she had to get new plates with the new car instead of transferring (actually it may have had something to do with the title of the car she was given still being in my parents name, I forget now).
Of course, none of this applies to vanity plates! Or the famous one letter or one number plates, which in Illinois are highly sought after because you have to be given them, and they're usually reserved for politicians. F'rinstance, ISTR that the governor had "1" for his personal plates, and Mayor Daley had "D". A through Z, AA through ZZ, and 1-100 are all spoken for, and the only way to get one is if you happen to be given it (the guy who has "F" only does because he got it with the car he bought from his aunt or something).
-William
(which smiley is the dorky one?)