I try to add a age verification to the day of birth field on the registration page.
For now I added this code to the `Varien.DateElement` validate function in the `js\varien\js.js` file:

```
today = new Date();
var dateLegal = new Date(today.getFullYear() - 18, today.getMonth(), today.getDate() );
console.log(dateLegal);
if (test.valueOf() > dateLegal.valueOf()) {
    error = 'You must be 18.......';
}

```

This works how I want it. The problem I have with this is, `Varien.DateElement` is for every date fields. There is a `Varien.DOB` special for day of birth. I tried to add there a validate function, but it will be never called.

```
Varien.DOB = Class.create();
Varien.DOB.prototype = {
    initialize: function(selector, required, format) {
        var el = $$(selector)[0];
        var container       = {};
        container.day       = Element.select(el, '.dob-day input')[0];
        container.month     = Element.select(el, '.dob-month input')[0];
        container.year      = Element.select(el, '.dob-year input')[0];
        container.full      = Element.select(el, '.dob-full input')[0];
        container.advice    = Element.select(el, '.validation-advice')[0];

        new Varien.DateElement('container', container, required, format);
    },
    validate: function() {
        var error = false;
       console.log("validate called"); //I will never be called
    }
};

```

So is there a better way to add a validation then to place it in `Varien.DateElement` ?