[{"faculty":"Some Faculty","students":[{"id":"51230867123","age":"21","name":"John Doe"},{"id":"0217356102","age":"22","name":"Jane Doe"},{"id":"0217356103","age":"24","name":"Jane Doe1"}]},{"faculty":"Other Faculty","students":[{"id":"1240876124","age":"21","name":"Jimmy Doe"},{"id":"2309857120578","age":"22","name":"Johnny Doe"}]}]

db.collection.find({"students.age":{$gt:"23"}},{"students":{$map:{input:{$filter:{input:"$students",cond:{$gt:["$$this.age","23"]}}},in:"$$this.name"}}})