My 9 year old tends to express his worries about the future. When he was younger, he wouldn't worry but expressed not wanting to do something. Now the worries can be about about finding a wife, if he will even marry, the job for him, etc. I have to slow him down and remind him he is 9 years old. Often, I have to tell him to think of three things he wants to do for the day. Otherwise, his mind races to the future. I've read that this does start happening at this age. But for us, the intensity of the experience is often multiplied. When worry gets the best of him a nice bit of time at the park often helps!