There are a lot of different model plane kits that are available to choose from. Every one of them will have different features and be a different size. Some people prefer to have the smaller ones while other people like to put together the larger ones.
People of any age can be excited about getting new model plane kits. There will be different skill levels for each one. People will be able to choose one that is at the level that they are at.
Most people are not going to start out by picking something from a difficult level. If they have help from someone who is experienced, it will not be a problem but a lot of people like to do these kinds of things by themselves. They want it to be something that they can do as a hobby.