Except for hubby, son and brother i have to buy for 6 girls! ages 16, 15, 9, two 8 year olds, and a 6 year old! Whew! my sisters who are 9 and 8 are into music big time! They are also always wanting clothes, movies, stuff like that, The first thing i thought of when i seen the age is a i-pod or a mp3 player, the mp3 are cheaper from what i have seen, also surf the net for top gifts for pre teens/teens. I also found this site where you put in their personality (answer a few questions) and they give you gift ideas, I did it and it is pretty cool hope this helps!
http://www.gifts.com/finder