Diego Rivera: Self-Portraits (5)

Source: WTL research files and photographs.
Image: "Self-portrait: The Ravages of Time"(1949). This watercolor self-portrait is in the collection of Marilyn O. Lubetkin.
Comments: In 1949, Frida Kahlo was readmitted to the Mexican Communist Party, but Rivera's application to be readmitted was rejected. In 1949, Mexican President Mateo Alemán called Rivera a "national treasure", and the Mexican muralist Orozco died.
Question: What is Rivera saying about himself in this rather small (31 x 26 cm.) watercolor?