D3 Examples - can i make this sortable or BETTER HELPppp

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<!DOCTYPE html>
<meta charset="utf-8">
<style>
​
body {
  font: 10px sans-serif;
}
​
.y.axis path {
  fill: none;
  stroke: #000;
  shape-rendering: crispEdges;
}
​
.x.axis path {
  fill: none;
  stroke: #000;
  shape-rendering: crispEdges;
}
​
.x.axis line {
display:none;
}
​
​
.x.axis text {
  font-weight:bold;
}
​
</style>
<body>
​
<p id="chart">
​
<p id="menu"><b>Filter States by Age Group</b><br>Age: <select></select>
​
<script src="https://d3js.org/d3.v3.min.js"></script>
<script>
​
var margin = {top: 20, right: 20, bottom: 30, left: 40},
    width = 960 - margin.left - margin.right,
    height = 400  - margin.top - margin.bottom;
​
var x0 = d3.scale.ordinal()
    .rangeRoundBands([0, width], .1);
​
var x1 = d3.scale.ordinal();
​
var y = d3.scale.linear()
    .range([height, 0]);
​
var color = d3.scale.ordinal()
    .range([ "rgb(223, 194, 125)", "rgb(191, 129, 45)","rgb(1, 102, 94)", "rgb(53, 151, 143)", "rgb(140, 81, 10)", "rgb(84, 48, 5)"]);
​
var xAxis = d3.svg.axis()
    .scale(x0)
    .orient("bottom");
​
var yAxis = d3.svg.axis()
    .scale(y)
    .orient("left")
    .tickFormat(d3.format("$"));
​
var svg = d3.select("body").append("svg")
    .attr("width", width + margin.left + margin.right)
    .attr("height", height + margin.top + margin.bottom)
    .append("g")
    .attr("transform", "translate(" + margin.left + "," + margin.top + ")");
​
d3.csv("data2.csv", function(error, data) {
  var ageNames = d3.keys(data[0]).filter(function(key) { return key !== "State"; });
​
  data.forEach(function(d) {
    d.ages = ageNames.map(function(name) { return {name: name, value: +d[name]}; });
  });
​
  x0.domain(data.map(function(d) { return d.State; }));
  x1.domain(ageNames).rangeRoundBands([0, x0.rangeBand()]);
  y.domain([0, d3.max(data, function(d) { return d3.max(d.ages, function(d) { return d.value; }); })]);
​
  svg.append("g")
      .attr("class", "x axis")
      .attr("transform", "translate(0," + height + ")")
      .call(xAxis);
​
  svg.append("g")
      .attr("class", "y axis")
      .call(yAxis)
    .append("text")
      .attr("transform", "rotate(-90)")
      .attr("y", 6)
      .attr("dy", ".71em")
      .style("text-anchor", "end")
      .text("Cost of premium");
​
  var state = svg.selectAll(".state")
      .data(data)
      .enter().append("g")
      .attr("class", "g")
      .attr("transform", function(d) { return "translate(" + x0(d.State) + ",0)"; });
​
  state.selectAll("rect")
      .data(function(d) { return d.ages; })
      .enter().append("rect")
      .attr("width", x1.rangeBand())
      .attr("x", function(d) { return x1(d.name); })
      .attr("y", function(d) { return y(d.value); })
      .attr("height", function(d) { return height - y(d.value); })
      .style("fill", function(d) { return color(d.name); });
​
​
});
​
</script>
    