var array = [{"name":"Joe", "age":17}, {"name":"Bob", "age":17}, {"name":"Carl", "age": 35}];
var unique = [];
var distinct = [];
for(var i = 0; i < array.length; i++ ){
  if(!unique[array[i].age]){
    distinct.push(array[i]);
    unique[array[i].age] = 1;
  }
}


gs.info(distinct);