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When there is a dissociative split to compartmentalize the trauma of a child being hurt by someone who loves them--and the abuse continues--so does the dissociative split. For children with DID (remember this is decided usually by age 6), the personality develops as fragmented. Many roles in the child's life become compartmentalized by amnesia, meaning the child (and later the adult) does not know of this splitting, nor the teenager, nor the adult. Some children may begin to heal when an abuser moves out of the home or is arrested. Safety is a factor for healing.
People with DID spend three to four decades of their lives (on average) before realizing they are dissociative. I can attest to this statistic since most of my clients with DID were between 35 and 45 with some younger and a few older. The survivor art shown at left is what it feels like when someone becomes aware she has DID. For me personally, as a therapist, and in witnessing survivor art and hearing other survivors' stories, this depiction "hits home". Anything leaking through the amnesia is terrifying to feel. It's not uncommon for the person to feel crazy. It doesn't help that society reinforces that message!