//HTML
<div>Index 0</div>
<div>Index 1</div>
<div>Index 2</div>
<div>Index 3</div>
<div>Index 4</div>


//SCRIPT
$(document).ready(function(){

        //get the number of DIV's
        var divCount = $('div').length;

        //check to see if the count is greater than 3
        if (divCount > 3) {

                //count starts at zero (0, 1, 2...)
                $('div:gt(2)').css('background','darkOrange');  

        }

});//jQuery

http://marioluevanos.com/playground/Select%20Lenght%20of%20Elements/

Useful if you want to manipulate/style/remove items after a given index count.

Select/Traverse based on Length of Elements

JavaScript