Template.visualize.onRendered(function() {

   Questions.find().observeChanges({

        added: function(){

            showAgeGroups();

        }

    });

});

​

function showAgeGroups() {

    var data = [

        {

            value: Questions.find({"age": "Under 18"}).count(),

            color: "#F38630"

        },

        {

            value: Questions.find({"age": "18-25"}).count(),

            color: "#E0E4CC"

        },

        {

            value: Questions.find({"age": "Over 35"}).count(),

            color: "#69D2E7"

        },

        {

            value: Questions.find({"age": "35-45"}).count(),

            color: "green"

        }

    ];

    var ctx = $("#age-groups").get(0).getContext("2d");

    ageChart = new Chart(ctx);

    new Chart(ctx).Pie(data);

}