Apple expands its App Store age rating system; developers must disclose app content, such as violent themes, letting Apple calculate and assign age ratings (Sarah Perez/TechCrunch)

Sarah Perez / TechCrunch: Apple expands its App Store age rating system; developers must disclose app content, such as violent themes, letting Apple calculate and assign age ratings  —  Apple is expanding its age-rating system for apps.  The company on Thursday said it has updated its age-rating system to add 13+ …