I'm really picky, so I don't change until I find one that I love, or I change it when something happens in my life.
I had a really bad semester one year, and I had been wearing D&G Light Blue, since then I can't stand to smell that stuff. It makes me sad.
So... when I got my new job I went out and bought Miss Dior Cherie. I'm still wearing it, and It will probably always remind me if my first year of teaching.