JSFiddle - React, Tailwind, and code Playground

HTML

<div id="gp_21" class="line">one</div>
<div id="gp_35" class="line">two</div>
<div id="gp_11" class="line">three</div>
<div id="gp_29" class="line">four</div>

<hr />

<div id="check"></div>

JavaScript

$(document).ready(function rt() {
    
    $('#gp_21').data("rtt", { age: '251351' });
    $('#gp_35').data("rtt", { age: '25131151' });
    $('#gp_11').data("rtt", { age: '251' });
    $('#gp_29').data("rtt", { age: '25131148' });
    
check();

});


function check()
{

    $('.line').each(function() {
    
     age = $('#'+this.id+'').data("rtt").age;
    
     $('#check').append('-> '+age+' - '+this.id+'<br />');
    
    
    });
    
}