JSFiddle - React, Tailwind, and code Playground

HTML

<table>
    <tr><th>City </th><th>    %Age   </th><th> Year</th></tr>
    <tr><td>NY   </td><td> 57% - 95% </td><td> 2011</td></tr>
    <tr><td>NY   </td><td> 30% - 65% </td><td> 2012</td></tr>
    <tr><td>FL   </td><td> 20% - 40% </td><td> 2012</td></tr>
    <tr><td>AL   </td><td> 10% - 50% </td><td> 2014</td></tr>
    <tr><td>AL   </td><td> 49% - 100% </td><td> 2014</td></tr>
    <tr><td>AL   </td><td> 0% - 15% </td><td> 2010</td></tr>
</table>

CSS

.gold { background: gold; }

JavaScript

jQuery.expr[":"].withinNum = function (el, i, m) {
    var v = $(el).text().match(/\d+/g)||'';
    return m[3] >= +v[0] && m[3] <= +v[1];
};
$("td:withinNum(50)").closest("tr").addClass('gold');