Date Picker - Available years

I'm attempting to override the default setting of -10 /+10 years in the Date Picker control, but having an issue where the years are displayed as 1101 to 1121. txtDateOfBirth is the JavaScript variable assigned to the Date Picker.

The code

NWF$(document).ready(function(){
    $('#'+txtHomePhone).mask('(000) 000-0000');
    $('#'+txtWorkPhone).mask('(000) 000-0000');
    $('#'+txtDateOfBirth).mask('00/00/0000');
    $('#'+txtSSN).mask('000-00-0000');
    $('#'+txtDependentDateOfBirth).mask('00/00/0000');
    $('#'+txtDependentSSN).mask('000-00-0000');
    $('#'+txtZipCode).mask('00000');
    $('#'+txtSignatureDate).mask('00/00/0000');
    $('#'+txtDependentSignatureDate).mask('00/00/0000');         
    $('#'+txtDependent2DateOfBirth).mask('00/00/0000');
    $('#'+txtDependent2SSN).mask('000-00-0000');
    $('#'+txtDependent3DateOfBirth).mask('00/00/0000');
    $('#'+txtDependent3SSN).mask('000-00-0000');
    $('#'+txtDependent4DateOfBirth).mask('00/00/0000');
    $('#'+txtDependent4SSN).mask('000-00-0000');
    $('#'+txtDependent5DateOfBirth).mask('00/00/0000');
    $('#'+txtDependent5SSN).mask('000-00-0000');
    $('#'+txtDateOfBirth).datepicker({
         changeYear:true,
            yearRange: "2005:2015"
        });
});‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍