Node.js lodash reduce() sum object attribute

var _ = require('lodash');

var people = [//ww w.  java2  s.  c  o m
  { id: 1, name: "Jim", age: 20, gender: 'm', enabled: true },
  { id: 1, name: "Jim", age: 20, gender: 'm', enabled: false },  
  { id: 2, name: "Bob", age: 34, gender: 'm', enabled: true },
  { id: 3, name: "Steve", age: 30, gender: 'm', enabled: true },
  { id: 4, name: "Nancy", age: 42, gender: 'f', enabled: true },
  { id: 5, name: "Frank", age: 30, gender: 'm', enabled: true },
  { id: 6, name: "Larry", age: 68, gender: 'm', enabled: true }
];

var totalAge = _.reduce(people, function(result, item) {
  return result + item.age;
},0);

console.log(totalAge);