[{name:"Danny",age:20,gender:0},{name:"Jordan",age:15,gender:1},{name:"Li Mei",age:20,gender:1},{name:"Soojin",age:17,gender:0},{name:"Zhang Ming",age:22,gender:1}]

db.collection.aggregate([{"$group":{"_id":"$gender","Test Field":{"$push":{age:"$age",name:"$name"}}}},{"$project":{_id:0}}])