The rate of learning declines at the rate of about one percent a year after the age of

The rate of learning is generally held to decline by about one percent a year after the age of 35.

This reflects a gradual, slow fall rather than a sharp drop in learning capacity with age.

Adults compensate through experience, strategies and motivation, so effective learning continues well beyond 35.

The figure 30 is too early for the commonly cited decline.

The figures 42 and 45 come after the usually stated onset age of 35.

Andragogy, associated with Malcolm Knowles, explains how adults learn effectively despite such age-related change.