I've got 3 albino California Kings, 1 Pueblan milk and 2 black milksnakes.
I had one Cali king for a year before I got the others. The year old stopped musking at about six months old. Just one day didn't musk and hasn't since. The baby kings and the Pueblan all still musk, and the baby black milks will musk if they're really ticked off.
I generally have a paper towel in hand when I go to handle any of the babies and just keep that around their vent area when I first pick them up until they get their musking done, and then just gently handle them for brief handling sessions (about five minutes). Don't know if it helps or not, but I feel that if they "learn" that musking isn't going to cause me to put them down, they'll eventually just quit. That's my theory and I'm sticking with it!
My three milks all seem to move more "jerkily" than the kings - the kings seem to be a little more laid back than the milks. I call my milks my psycho kids! LOL