Another 32+ Beginner Acoustic Guitar Half Size. These are quite popular with young students aged between 5 and 8 years (around 3'10 to 4'6″), who're keen to start learning the guitar. Unless you are a professional guitar player that as a beginner, it's important to choose a guitar that feels, sits, and plays comfortably in your own. A basic guide for beginners with explanations of acoustic guitar types and examples of different body sizes.