Yes normally adults are much more tolerant, assuming they've had good experiences when handled. That's the other thing, I assumed you plan to get a hatchling,
and they are more delicate and fearful...many more things prey on snakes when they're small, & their eating is not yet established. An adult snake that's been feeding
a while is less put off by handling when they're "new" to you, but other things (like the time of year) can make them fast.

In the wild, they become a braver & better predator as they grow to adult size, but they still have natural enemies. Remember that BPs are ambush-predators, they
don't normally go out & actively hunt prey, they sit & wait for prey to come close enough, so their nature is shy & laid-back.