I do have to say and I put it in a thread somewhere. I do have a cohabbed pair.
I know that they are both female cause they have both layed eggs and they are in a 100 gal tank. Plus, I have a couple more divided tanks but more often then not most the people that are asking are new. And I have a big probably telling someone that it is ok the cohab knowing that there is a risk when I know that if they don't cohab there isn't that same risk. Most of these problems come from people who don't know their snake inside or out, like we do. My biggest reason for bringing up the age thing is because I have seen many times at pet stores where people are told that they can cohab until 2 because the can not become gravid before that and we all know that just isn't the truth.