MNblockhead
A Title Much Cooler Than Anything on the Old Site
As I just posted a chunk about their lifestyle we know the answer to this. They are born with language and knowledge. They still live with their parent for a short while. But it's not a long time. Some dragons do socialize, but for most chromatics they never want another Dragon entering their territory even if it's their parent or child.
Where is that information from? I found the Wikia article that seems copied from, but the Wikia article doesn't give any cites to RAW.
The MM and Volo's do not have this life-cycle information.
That said, seems about right given the stats and fluff that are in the MM.
I guess I play them pretty close to RAW but I homebrew them to be more social than described in the Wikia article. Not social in the humanoid sense, perhaps, but still there is interaction and knowledge transfer as well as working together and against each other.