Bro this study was made in the 80s at that time the amount of data available about dpdr was almost none. The psychiatrist community definitely change their view about the onset age about dpdr. Actually if you see the new studies they will show that dpdr is more common to start in teenages than adults."Depersonalization is a comparatively rare disease in the psychiatric field. Particularly, its occurrence in early adolescence or even before seems to be quite uncommon.
We have observed 120 cases of depersonalization, of which only 16 cases had their onset before the age of 15.”
I saw the study above and ive had this as long as i can remember- im 16 years old right now