Roger Rosenblatt is running out of friends.

Joined by his colleagues and confidants at 10:45 a.m. each weekday in the Amphitheater, Rosenblatt will lead discussions on the literary arts ranging from cartoons to television to children’s literature. This is his third year playing the role of host — the series began in 2008 and recurred in 2010. And because each week requires a minimum of five friends, he joked that his resources are wearing thin.

“I also wanted to make sure that everyone in the group was older than me,” Rosenblatt said, “but that’s getting more and more difficult.”