Football remains the most popular sport in this country in terms of overall TV ratings. But the average age of people who are watching football is rising, whereas the age of basketball viewers has remained remarkably stable, suggesting that even as basketball fans age, new younger viewers keep tuning in. Over the past decade, the average viewer of ESPN's professional basketball broadcasting hasn't budged at all—it's been 37 years old since at least 2004. The average football viewer, however, has climbed from 43 years old to to 47. For baseball it has been even worse—it has gone from 46 years old to 53.
Washington Post