It's doubtful that it's suitable for all ages. Horror stories by nature are meant to evoke fear, and they often use tactics like jump scares, grotesque imagery, and psychological manipulation. These elements can be very disturbing for young children. Even some teenagers might find certain aspects of the stories in this book too intense. So, it's more of an option for those who are old enough and have an inclination towards horror - themed literature.
Most likely not. Horror stories usually contain elements that can be too intense or frightening for young children, such as violence, gore, or disturbing concepts.
No. Horror books are often targeted at an older audience. They might have themes like death, the afterlife, and evil that are not suitable for younger minds. 'the fourth pan book of horror stories' is likely to have stories with such elements that are better suited for teenagers and adults who can handle the scares and the darker themes.