I think most people look at 3 years as the breedable age for females, as long as they are in good health of course. Males can breed at 1.5 years without issue. If fed really aggressively females can breed at 1.5 years as well, but it will probably have some health impacts.

Also, some amount hibernation is typically needed for successful breeding, so if your pair wasn't hibernated they probably won't go this year.
Congrats on your new snakes, and good luck!
Josh