I can never recommend putting dragons of any age together. Breeders can tell you that even very young dragons will fight and chew off each others toes and nails. Both my dragons and my boyfriend's have slight injuries from cagemates and my boyfriend got his when the dragon was only 6 weeks old. They are very teritorial creatures and the older they get the more likely it gets that they will fight.
Sara
As a breeder I also agree with everyone else, do not house them together. We house only 5 together at a time until they get a lil older then we start to separate them or sell them! The problem you may have is you may not no how old the other dragon is and they may get aggressive towards one another. You could end up with the nips or even worse death! Well good luck and hope this helps!!!