Early childhood for me too. I used to visually and auditorally (is that a word?) hallucinate a monkey outside my closet door when I was 3 and 4 years old. That was the first things that happened, though I did not see a psychiatrist until I was 18.

Paranoia also started young. I can remember being paranoid in the fourth grade after I left Montessori and went into regular school. It's been constant since then (I'm turning 45 in December).