I moved from Romania to England when I was 11. At around the age of 12 I really started thinking in English for most of my thoughts. The only times I did and still do think in Romanian is when I either tell myself to, or when I am thinking about family or any other thing related to Romania. You simply cannot think of a person who only speaks a language to you in another language, mostly because you do not know how they would speak that language, not only the accent but also the sentence structure they would use and their vocabulary. Since thinking bilingually I have also noticed that sometimes I do not even think in any language, I just have thoughts floating around. This is a very weird thing sometimes as I know what I am thinking about, but if I try to explain it I have a hard time putting my thoughts into actual words.