I hope you keep an open mind about the future. In 4-5 years you might be going to college or trying to find your first apartment. You might leave your dog/dogs with your parents if they are willing to care for them while you are in school and two energetic dogs might not be something they are up to dealing with. And finding a place is hard enough with one. Maybe you can find an adult dog that is still playful now, but that you'd expect to have slowed down quite a bit by that time. An adult will probably be trained and neutered too which leaves less worry for your parents.