No you cant house to beardies together 1 beardie 1 viv . Housing 2 beardies together causes stress , also mating the male will always mate with the female this can cause death in some cases . The mate can become dominate causing the female to be stressed and not eat.
BUt if that viv is that big then divide it so they are separate dividers are inexpensive or you could get plexi glass cut as a divider. But you will need to have a basking side and a cool side for each beardie..
Beardies really never stop growing around 2 years old they slow down on growing .
Rule of thumb is 1 beardie 1 viv but if your viv is that big then plexi glass divider or some sort of divider so they cant see each other the male will stress the female out they do become territorial over their vivs.