I just bought my 5 year old the 3ds, from what I have heard within the next year or so Nintendo is going to stop selling and making all the other versions of the DS. You can play all the old games on the 3ds, obviously just not in 3d. My son loves it. Just make sure you dont let them use the 3D untill they are older, it will mess up their eyes. The built in wifi and camera are pretty cool for the kids as well.