I still remember my imaginary friends! Their names were "Squeaky" and "Bookey" and I had to leave them behind when I moved cross country at the age of four. I'm still not entirely clear on whether it was my idea or my parents' to leave them behind.
My DD8 had a wonderful IF named "Prince John", who disappeared around the time she was 4.5, when her little brother was born. I happened to notice he hadn't been around lately, so I asked her about him. She told me that he'd left on a long trip and he was too busy and didn't have time for her any more. Ouch.
