Simplify the following text for a Grade 6 native English-speaking person.
Original: At age 15 , though Xenia and Alexander wanted to marry , her parents were reluctant to trust because Xenia was too young and they were unsure of Alexander 's character .
Simplified: At age 15 , though Xenia and Alexander wanted to marry , her parents did not want to allow them because Xenia was too young . They were also unsure if Alexander was really very nice .