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Spring '16 Release Notes document a new system method supporting this:

Test.setCreatedDate(recordId, createdDatetime)

Sets CreatedDate for a test-context sObject.

This will definitely complement the loadData() and deserialize() techniques.

Account account = new Account(Name = 'Test');
insert account;

Datetime yesterday = Datetime.now().addDays(-1);
Test.setCreatedDate(account.Id, yesterday);

Spring '16 Release Notes document a new system method supporting this:

Test.setCreatedDate(recordId, createdDatetime)

Sets CreatedDate for a test-context sObject.

This will definitely complement the loadData() and deserialize() techniques.

Account account = new Account(Name = 'Test');
insert account;

Datetime yesterday = Datetime.now().addDays(-1);
Test.setCreatedDate(account.Id, yesterday);

Test Class: Contains methods related to Apex tests.

setCreatedDate(recordId, createdDatetime)

Sets CreatedDate for a test-context sObject.

All database changes are rolled back at the end of a test. You can’t use this method on records that existed before your test was executed. You also can’t use setCreatedDate in methods annotated with @isTest(SeeAllData=true), because those methods have access to all data in your org. If you set CreatedDate to a future value, it can cause unexpected results. This method takes two parameters—an sObject ID and a Datetime value—neither of which can be null.

Insert your test record before you set its CreatedDate, as shown in this example.

@isTest 
private class SetCreatedDateTest {
    static testMethod void testSetCreatedDate() {
        Account a = new Account(name='myAccount');
        insert a;
        Test.setCreatedDate(a.Id, DateTime.newInstance(2012,12,12));
        Test.startTest();
        Account myAccount = [SELECT Id, Name, CreatedDate FROM Account 
                             WHERE Name ='myAccount' limit 1];
        System.assertEquals(myAccount.CreatedDate, DateTime.newInstance(2012,12,12));
        Test.stopTest();
    }
}

Spring '16 Release Notes a new system method supporting this:

Test.setCreatedDate(recordId, createdDatetime)

Sets CreatedDate for a test-context sObject.

This will definitely complement the loadData() and deserialize() techniques.

Account account = new Account(Name = 'Test');
insert account;

Datetime yesterday = Datetime.now().addDays(-1);
Test.setCreatedDate(account.Id, yesterday);

Spring '16 Release Notes document a new system method supporting this:

Test.setCreatedDate(recordId, createdDatetime)

Sets CreatedDate for a test-context sObject.

This will definitely complement the loadData() and deserialize() techniques.

Account account = new Account(Name = 'Test');
insert account;

Datetime yesterday = Datetime.now().addDays(-1);
Test.setCreatedDate(account.Id, yesterday);

Spring '16 release documents a new system method supporting this:

Test.setCreatedDate(recordId, createdDatetime)

Sets CreatedDate for a test-context sObject.

This will definitely complement the loadData() and deserialize() techniques.

Account account = new Account(Name = 'Test');
insert account;

Datetime yesterday = Datetime.now().addDays(-1);
Test.setCreatedDate(account.Id, yesterday);

releasenotes.salesforce.com/en-us/spring16/release-notes/rn_apex_new_classes_methods.htm

Spring '16 Release Notes a new system method supporting this:

Test.setCreatedDate(recordId, createdDatetime)

Sets CreatedDate for a test-context sObject.

This will definitely complement the loadData() and deserialize() techniques.

Account account = new Account(Name = 'Test');
insert account;

Datetime yesterday = Datetime.now().addDays(-1);
Test.setCreatedDate(account.Id, yesterday);