Simplify the following text for a Grade 7 native English-speaking person.
Original: With the death of 114-year-old American Emma Tillman on 28 January 2007 , Minagawa became the oldest living person in the world .
Simplified: With the death of 114-year-old Emma Tillman on January 29 , 2007 , Minagawa became the world 's oldest living person .