If you want additional user information for the forms, such as the date of birth of the customer, then the current date picker is not optimal for selecting a date of birth which is 20 or 30 years old. It would better make sense to select year and month in a dropdown or similar. At the moment you have to laboriously click through all the years and months.

This is my feedback and feature request, thanks and regards
Corsin

Hi, a solution can be to do yourself the datepicker : create an input ( type text ) and onclick open a datepicker.

The difficulty is that there is no class or id specified for the input, but there is for the label, when required.

1. Create a custom field, input type text ( ID: 14 for example )

2. Call yourself Datepicker with wordPress ( inside functions.php ) : 

add_action('wp_enqueue_scripts', 'add_scripts_datepicker');
function add_scripts_datepicker() {
    wp_enqueue_script('jquery-ui-datepicker');
    wp_enqueue_style('jquery-ui-css', 'https://code.jquery.com/ui/1.12.1/themes/base/jquery-ui.css');
}

3.  Add this code in a custom js also called in your functions.php : 

window.ameliaActions = {
  InitInfoStep: function (success = null, error = null, data) {
    console.log('InitInfoStep HOOK');

    // Fonction pour initialiser un Datepicker et ajouter le formatage
    function initDatepickerForInput(input) {
      if (input) {
        // Initialiser le Datepicker
        jQuery(input).datepicker({
          dateFormat: 'dd/mm/yy',
          changeMonth: true,
          changeYear: true,
          yearRange: '-90:-12',
          defaultDate: new Date(1980, 0, 1),
        });

// ( i added the possibility to enter dd/mm/yyyy ) it is optionnal

       input.addEventListener('input', function () {
  let value = this.value.replace(/[^0-9]/g, ''); 

  // Ajouter le '/' après les 2 premiers caractères (jour)
  if (value.length >= 2) {
value = value.slice(0, 2) + '/' + value.slice(2);
  }

  // Ajouter le '/' après les 4 premiers caractères (mois) si la longueur dépasse 4 caractères
  if (value.length >= 5) {
value = value.slice(0, 5) + '/' + value.slice(5);
  }

  // Limiter la longueur à 10 caractères (dd/MM/yyyy)
  if (value.length > 10) {
value = value.slice(0, 10);
  }

  this.value = value;
});

      }
    }

    // Initialiser le Datepicker pour cf14
    const labelCf14 = document.querySelector('label[for="cf14"]');
    if (labelCf14) {
      const inputCf14 = labelCf14.nextElementSibling.querySelector('.el-input__inner');
      initDatepickerForInput(inputCf14);
    }

  }
};

** I se no other solution to target an input from a custom field, but you can always target the 2nd input, 3rd etc... if it is not required and you have no label to target.

Tell me if it helps