The old man represented in this portrait, seated a chair in front of a curtain that has been pulled to the side, has not been identified. He is wearing a 'tabbaard', which is a long black gown that is lined with fur. This together with the book he is holding suggests that he may be scholar. There is also another portrait by Maes of the same sitter, dated 1665, which was formerly in the Johnson collection in Washington, DC.
The National Gallery, Trafalgar Square, London WC2N 5DN