Everyone will advise you to keep them separated.

And from my experience, I have 2 baby beardies around that age and unfortunately, they fought yesterday. (The reason why I had them together was because one of their basking lights burnt out). I have a boy and a girl (at least I still hope so!). About the mealworms, don't give em those. Mealworms have a hard shell and is hard to digest and which can lead to impaction. As for feeding appropriate insects, no bigger than the space between their eyes, and as much as they can eat in a 10-15 minute interval, 2-3 times a day.