Thing number four. Providing that they don't starve, Changelings are practically immortal. They can be killed, like anything else, and they can die from starvation. But so long as they have a ready and constant supply of food they will essentially live until they are killed.
TRUE! Though in Papi’s canon there has never been a changeling allowed to live to such an extent, they are effectively lobsters in that regard. So long as they are fed, and not attacked, a hive could hypothetically continue indefinitely.