Edit in JSFiddle

var UserForm = Backbone.Model.extend({
    validation: {
        name: {
            required: true,
            rangeLength: [1, 20]
        },
        email: {
            required: true,
            rangeLength: [1, 50],
            pattern: 'email'
        },
        age: {
            required: true,
            range: [0, 200]
        }
    }
});

var UserFormView = Backbone.View.extend({
    bindings: {
        '#name': 'name',
            '#email': 'email',
            '#age': 'age'
    },
    events: {
        'click [name="confirm"]': 'create'
    },
    initialize: function () {
        Backbone.Validation.bind(this);
    },
    render: function () {
        this.stickit();
        return this;
    },
    create: function () {
        if(this.model.isValid(true)) {       
            // this.model.save();
            alert('Great Success!');
        } else {
            alert(JSON.stringify(this.model.validate()));
        }
        return false;
    }
});

var userForm = new UserForm();
var userFormView = new UserFormView({
    model: userForm,
    el: $('#userForm')
});
userFormView.render();

<form id="userForm" method="post" action="#create">
    <label for="name">Name:</label>
    <input name="name" id="name" />
    <br>
    <label for="email">Email:</label>
    <input name="email" id="email" />
    <br>
    <label for="age">Age:</label>
    <input name="age" id="age" />
    <br>
    <button name="confirm">Confirm</button>
</form>