Are the 7 year olds 48" yet? That's the magic number for Cedar Point, and a lot of places really. My eight-year-old hit 48" a couple years ago, so if they're at that, they are going to have a great time at Cedar Point. Less than that, you pretty much just have flats. There are a lot at CP, and they can have fun, but it's going to be just the two children's areas really. If they are 48", you have Millennium Force, Magnum, Gemini, and more.
Yes they are both above 48" so thankfully they will be able to go on a vast amount of rides while we are at the park. The one twin loves roller coasters, the other a little more hesitant. As I stated, they've gone on everything they are able to based on height restrictions at Darien Lake here in Buffalo, NY. I find it funny that they aren't tall enough to go on Ride of Steel (Formally Superman), yet they are able to go on Millenium Force, which is just over 100ft taller.