Beverly Cleary, the children’s author whose books about Ramona Quimby, Henry Huggins and others captured the spark and struggles of “kids like us,” doesn’t mind if you celebrate her birthday. After all, she turns 100 on Tuesday. Now living in a retirement community in Carmel, California, Cleary plans to celebrate with a slice of carrot cake. But it’s fine if others celebrate, including the “Drop Everything and Read” effort sponsored by her publisher. “Go ahead and fuss,” she told the Washington Post of her centennial birthday. “Everyone else is.”