Google has a good grasp of reading age, subject matter complexity and its impact on user engagement, which it broadly equates to a relationship between reading age and subject matter. By way of example, if you are discussing recent changes in the clinical diagnosis of psychopathy, then Google will expect a high reading age combined with the use of terms consistent with the subject matter. Conversely, if you are producing content for young people about skin hygiene, then pitching the reading age at or below the target audience age is important. Accurately assessing the reading age increases engagement, dwell time, entanglement and the likelihood of the content being shared.