sorting is breaking :(

<!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="menu"><b>Filter States by Age Group</b><br>Age: <select></select>

var margin = {top: 20, right: 20, bottom: 30, left: 40},
    width = 960 - margin.left - margin.right,
    height = 500 - 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("#chart").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 menu = d3.select("#menu select")
    .on("change", change);

menu.selectAll("option")
      .data(data)
      .enter().append("option")
      .text(function(d) { return d; });

menu.property("value", "18 to 24 Years");

redraw();
});

var altKey;

d3.select(window)
    .on("keydown", function() { altKey = d3.event.altKey; })
    .on("keyup", function() { altKey = false; });

function change() {
  clearTimeout(timeout);

d3.transition()
      .duration(altKey ? 7500 : 750)
      .each(redraw);
}

function redraw() {
  var age1 = menu.property("value"),
      top = states.sort(function(a, b) { return b[age1] - a[age1]; }); //this is where i'm getting confused -- how can i redraw without using this "top" variable?

y.domain(top.map(function(d) { return d.State; }));

var state = svg.selectAll(".state")
      .data(top, function(d) { return d.State; });

var stateEnter = state.enter().insert("g", ".axis")
      .attr("class", "state")
      .attr("transform", function(d) { return "translate(" + x0(d.State) + ",0)"; });

stateEnter.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); });

x.domain([0, top[0][age = age1]]);

var stateUpdate = d3.transition(state)
      .attr("transform", function(d) { return "translate(" + (d.x0 = x(d.State)) + ",0)"; })
      .style("fill-opacity", 1);

stateUpdate.select("rect")
        .attr("height", function(d) { return height - y(d.value); });

stateUpdate.select("value")
        .attr("y", function(d) { return height - y(d.value) - 3; });

var stateExit = d3.transition(state.exit())
        .attr("transform", function(d) { return "translate(" + (d.x0 + width) + ",0)"; })
        .style("fill-opacity", 0)
        .remove();

stateExit.select("rect")
        .attr("height", function(d) { return height - y(d.value); });

stateExit.select("value")
        .attr("y", function(d) { return height - y(d.value) - 3; });

d3.transition(svg).select(".yAxis.axis")
      .call(yAxis);
    }

var timeout = setTimeout(function() {
  menu.property("value", "60 years old w/ subsidy").node().focus();
  change();
  }, 5000);

</script>

Modified http://d3js.org/d3.v3.min.js to a secure url

https://d3js.org/d3.v3.min.js