Make Believe Friends

"At what age do children stop having make believe friends?" my husband whispered.
"Don't even worry about it. There is nothing wrong with our daughter- just don't give it any attention," I told him.
Yes, she is seven and a normal seven-year-old probably wouldn't still have a make believe friend but hey, we've always said she is "cut from a different cloth". She didn't have them when she was younger- when it would be easier to accept I guess.
But there isn't anything wrong with her- I would have tried to get disability. (just kidding)
Her make believe friend's name is Wilbur. She doesn't try to hide him either. Wilbur usually comes out to drive others in the house up a wall. She has talked to him while I was "blessing" her out about something she had done wrong. I popped her and Wilbur. I got him good- darn near abused him.
Wilbur also appears when she wants to make her brother mad but recently he got the upper hand.
I was just finishing up her hair- great time for her brother to come in and mess with her because she has to keep still. She began singing and her brother tried to chime in- singing the wrong words purposely.
"Stop!" she yelled.
He continued and attempted to get louder.
She really wanted to reach out and get him but I wasn't finished.
"I'm just gonna play with Wilbur then- come on Wilbur!" she said.
"I'm gonna play with Wilbur too," he teased.
"Ha! He said he doesn't want to play with you!" she smiled.
Her brother paused for a moment then said, "Take that Wilbur!" While pretending to choke Wilbur.
She let it go on for a minute then folded her arms and said, "Wilbur's not even over there anyway. That's CeeCee!"