Your current function is parsing your entry and look for age field. It needs to be
var min = $('#min').val();
var max = $('#max').val();
var date = data[4]; // use data for the age column
if ( ( min == '' && max == '' ) ||
( min == '' && date <= max ) ||
( min <= date && '' == max ) ||
( min <= date && date <= max ) )
{
return true;
}
return false;