The older you get, the more likely you are to experience tooth damage (chips, breaks, cracks). However, it can happen to anyone regardless of age. While some people are more prone to it, others are not. For example, an unstable bite will cause your teeth to crack, chip, or break over and over again while a sports injury will not.
From grinding your teeth and clenching your jaw to an unstable bite, it can happen for a number of reasons.