Who wants to spend their beach vacation reading about growing older? These recommendations just might surprise you. “The Accomplished Guest” by Ann Beattie Ann Beattie’s 1983 book of short stories, “The Burning House,” explored the drift, emotional detachment, and cynicism of boomers, whose worldview was darkened by Watergate. That book made Beattie’s reputation, and she has been prolific ever since, including regular appearances in The New Yorker. Her 2017 short story volume, “The Accomplished Guest,” is, for now, a bookend to “The Burning House” (Beattie is only 69 and no doubt has more books in her). While baby boom skepticism remains a central theme, her characters have developed a little heart and…