不满足查询条件的Mongodb

Question

我想知道在执行mongodb查询时是否可以检查哪个条件不符合。

User: {
   name : 'John',
   age : 18
}

User.findOne({
    'name' : 'John',
    'age' : { $gte : 20}
}, function(err,result){
   // here get some kind of error that a 'John' was found but not with that age
})