Question: In issuing the grade, the Corporate Library found that a third of Comcast's board was how old?
Sentence: According to Corporate Library, Comcast's board of directors ability to oversee and control management was severely compromised (at least in 2010) by the fact that several of the directors either worked for the company or had business ties to it (making them susceptible to management pressure), and a third of the directors were over 70 years of age.
Answer in sentence: yes