The next after maturity, biologically is becoming old, and our soul life our body, into the next life. We end this body to alter our form into spirit being.
World Six is the outcome of the interaction between World Four that realized being arriving in a wrong destination, meeting and enjoying the presence of World One, the child with every simplicity and smiles, that make both communicate to each other, even though the child does not speak adult language, even though the life after this life is not speaking anymore in human language.