According to researchers at the University of Washington and University of Oregon, two out of every three children has had an imaginary friend by age seven. My son, now 7, first started talking to his imaginary friend, named Purpit (don't ask, because I don't know) around age 3. He still talks to him now and then, but mostly on the phone. Apparently, Purpit has moved away. At least he's a good enough friend to call now and then, though. My own imaginary friends (I had two) haven't talked to me since I was four!