I was born with grey eyes, that turned blue (my father's color). At the age of five my eyes turned to hazel (my mother's color). All the way until this year my eyes had an orange ring around my pupil and they would look more brown (my grandmother's color) or green depending on the day and my mood. My friends have always noticed this and used to comment on my "mood eyes" =p
This year the orange has begun to disappear and my eyes are entirely green! I love that they're green now, I wasn't too partial to hazel and always liked green eyes.
My daughters eyes went from grey to hazel, then brown (like my husband). I'm wondering if they'll change again since she's five (the time my eyes changed).
The point is, eye color can change throughout the years. I don't think it's anything to worry about.
Hair color changes too. My whole family was born dirty blonde, grew up as brunettes, and died with jet black hair. No grey hairs for me! =)