For YA fiction, here’s an approach I am taking to heart. My choices of words, the structure of sentences and even paragraphs need to reflect the age and level of maturity of the main character(s). As the characters change and grow, the complexity of the sentences can grow. But their youth limits their world view. So I’ve been working on using sentences that are declarative. Short. The rhythm of the language reflects the characters’ thought processes. Thoughts seldom–okay never–move in a straight line. Emotions can be explosive, or flighty, or hesitant, depending on the character’s temperament at the time. Pacing changes with the characters’ activity and the pressures they confront.