I'm not sure exactly what age I was. It's been for as long as I can remember. My first character obsession was Minnie Mouse. Now it's none other than the one, the only, Tigger!
I know I loved Mickey's Christmas Carol when it came out. I watched it year round. I also used to imitate the parade from Donald's birthday celebration when he turned 50. I still remember the song "Happy birthday, it's Donald's birthday. Happy, happy, birthday to you". I had a Santa Clause placemat that I'd dance around with and pretend it was one of the signs that the parade dancers had. I think I was like 1. I was born in 1983 and Donald turned 50 in 1984, didn't he?
But, the deal breaker was most likely in 1988, when I first went to WDW. I loved it! I'll always remember eating in the castle and I remember Cinderella coming to our table. At the time, I didn't know it was her job to go to all the tables, I just thought that we were special. I also wanted to take all my toy/stuffed Minnie's to WDW to show the "real" Minnie Mouse. There were considerably fewer Minnies than there are Tiggers now, but still, it was a lot. On that trip, when I was 5 years old, I decided that it was my dream to one day work at WDW. I achieved that dream in 2002 when I participated in the college program.