D3 Titanic plot age/gender

<!DOCTYPE html>
<meta charset="utf-8">
<style>

.bar rect {
  fill: steelblue;
}

.bar text {
  fill: #fff;
  font: 10px sans-serif;
}

</style>
<svg width="960" height="250" id="svg1"></svg>
<svg width="960" height="250" id="svg2"></svg>
<script src="https://d3js.org/d3.v4.min.js"></script>
<script>

d3.csv('titanic.csv', function(error, data) {
 data.forEach(function(d) {
        d.Age = +d.Age;
        });
  
        ageAll = data.filter(function(d) {
          return (d.Age !== 0) & (d.Sex == 'female');
        })
        .map(function(d) {
          return d.Age;
        });

var data = ageAll;
var chartWidth = 600;
var formatCount = d3.format(",.0f");

var svg = d3.select("#svg1"),
    margin = {top: 10, right: 30, bottom: 30, left: 30},
    width = +svg.attr("width") - margin.left - margin.right,
    height = +svg.attr("height") - margin.top - margin.bottom,
    g = svg.append("g").attr("transform", "translate(" + margin.left + "," + margin.top + ")");

var x = d3.scaleLinear()
           .domain([0, 100])
           .rangeRound([0, chartWidth]);

var bins = d3.histogram()
    .domain(x.domain())
    .thresholds(x.ticks(20))
    (data);

var y = d3.scaleLinear()
    .domain([0, d3.max(bins, function(d) { return d.length; })])
    .range([height, 0]);

var bar = g.selectAll(".bar")
  .data(bins)
  .enter().append("g")
    .attr("class", "bar")
    .attr("transform", function(d) { return "translate(" + x(d.x0) + "," + y(d.length) + ")"; });

bar.append("rect")
    .attr("x", 1)
    .attr("width", x(bins[0].x1) - x(bins[0].x0) - 1)
    .attr("height", function(d) { return height - y(d.length); });

bar.append("text")
    .attr("dy", ".75em")
    .attr("y", 6)
    .attr("x", (x(bins[0].x1) - x(bins[0].x0)) / 2)
    .attr("text-anchor", "middle")
    .text(function(d) { return formatCount(d.length); });

g.append("g")
    .attr("class", "axis axis--x")
    .attr("transform", "translate(0," + height + ")")
    .call(d3.axisBottom(x)); 
});

d3.csv('titanic.csv', function(error, data) {
 data.forEach(function(d) {
        d.Age = +d.Age;
        });
  
        ageAll = data.filter(function(d) {
          return (d.Age !== 0) & (d.Sex == 'male');
        })
        .map(function(d) {
          return d.Age;
        });

var data = ageAll;
var chartWidth = 600;
var formatCount = d3.format(",.0f");

var svg = d3.select("#svg2"),
    margin = {top: 10, right: 30, bottom: 30, left: 30},
    width = +svg.attr("width") - margin.left - margin.right,
    height = +svg.attr("height") - margin.top - margin.bottom,
    g = svg.append("g").attr("transform", "translate(" + margin.left + "," + margin.top + ")");

var x = d3.scaleLinear()
           .domain([0, 100])
           .rangeRound([0, chartWidth]);

var bins = d3.histogram()
    .domain(x.domain())
    .thresholds(x.ticks(20))
    (data);

var y = d3.scaleLinear()
    .domain([0, d3.max(bins, function(d) { return d.length; })])
    .range([height, 0]);

var bar = g.selectAll(".bar")
  .data(bins)
  .enter().append("g")
    .attr("class", "bar")
    .attr("transform", function(d) { return "translate(" + x(d.x0) + "," + y(d.length) + ")"; });

bar.append("rect")
    .attr("x", 1)
    .attr("width", x(bins[0].x1) - x(bins[0].x0) - 1)
    .attr("height", function(d) { return height - y(d.length); });

g.append("g")
    .attr("class", "axis axis--x")
    .attr("transform", "translate(0," + height + ")")
    .call(d3.axisBottom(x)); 
});
</script>

https://d3js.org/d3.v4.min.js