hey i have OSDD-1 and i think you might have just misinterpreted things said by blogs like this-is-not-dissociative? the first alters always form in childhood, but you can absolutely form new alters later in life if new trauma occurs. i’ve never seen a DID/OSDD blog say otherwise, it’s pretty widely accepted. also, some systems are ok with the term “fictives” rather than “fictional introjects” – it just depends on the person. just a heads up

Systems may be ‘fine’ with the term ‘fictive’ but its not a DID/OSDD term. The medical term is ‘fictional introjects’. I clarify this because I have had DID/OSDD people tell me that people without DID/OSDD can not use the term fictive; which is embarrassing because ‘fictive’ is not originally a medical term but comes from the natural multiplicity community. 

As for the thing about not creating alters past childhood, I’m not sure what I said that you’re referring to, and can’t comment solidly on my interpretation without that information.