text: why does your singing voice change when you become older? as i have become older my singing voice seems to be changing. i can't seem to sing higher than i used to why is that changes in the singing voice are caused by physical changes in the larynx. at puberty, your body is growing and the increase in the size of your larynx causes the first voice change. as you age further, the vocal folds (which are mere folds in the muscle, not chords as so many people believe) grow looser, making it more difficult to hit those high notes.