Leonardo's face is best known from a drawing in red chalk that appears to be a self-portrait. However, there is some controversy over the identity of the subject, because the man represented appears to be of a greater age than the 67 years lived by Leonardo. A solution which has been put forward is that Leonardo deliberately aged himself in the drawing, as a modern forensic artist might do, in order to provide a model for Raphael's painting of him as Plato in "The School of Athens".