Preparation code

<script src="//cdnjs.cloudflare.com/ajax/libs/underscore.js/1.4.4/underscore-min.js"></script>
<script>
  Benchmark.prototype.setup = function() {
    var array = [
    {"name":"Joe", "age":17},
    {"name":"Bob", "age":17},
    {"name":"Carl", "age": 35},
    {"name":"Joe", "age":17},
    {"name":"Bob", "age":17},
    {"name":"Carl", "age": 35},
    {"name":"Joe", "age":17},
    {"name":"Bob", "age":17},
    {"name":"Carl", "age": 35},
    {"name":"Joe", "age":17},
    {"name":"Bob", "age":17},
    {"name":"Carl", "age": 35},
    {"name":"Joe", "age":17},
    {"name":"Bob", "age":17},
    {"name":"Carl", "age": 35},
    {"name":"Joe", "age":17},
    {"name":"Bob", "age":17},
    {"name":"Carl", "age": 35},
    {"name":"Joe", "age":17},
    {"name":"Bob", "age":17},
    {"name":"Carl", "age": 35},
    {"name":"Joe", "age":17},
    {"name":"Bob", "age":17},
    {"name":"Carl", "age": 35},
    {"name":"Joe", "age":17},
    {"name":"Bob", "age":17},
    {"name":"Carl", "age": 35},
    {"name":"Joe", "age":17},
    {"name":"Bob", "age":17},
    {"name":"Carl", "age": 35},
    {"name":"Joe", "age":17},
    {"name":"Bob", "age":17},
    {"name":"Carl", "age": 35}
    ];
  };
</script>

Test runner

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console.log(_.chain(array).map(function(item) { return item.age }).uniq().value());

var ages = array.map(function(obj) { return obj.age; });
ages = ages.filter(function(v,i) { return ages.indexOf(v) == i; });

console.log(ages); //=> [17, 35]

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