How do I get a Google recovery back up codes as I can not get into my old email account

As you are not able to receive recovery code for Gmail account on the phone number associated with it, you can request Google to send the same on the recovery email ID that you may have mentioned. To know how to do this, the following link can be helpful:
https://support.google.com/mail/answer/185710?hl=en

GuruAid.com

Reactivate your old Yahoo email account.
https://answers.yahoo.com/question/index?qid=20120415011129AAi9TjA
Reset gmail password, which I believe will be sent to the reactivated Yahoo account above.
https://www.google.com/accounts/recovery/
Change email associated with your google/gmail account from the old Yahoo eamil account you just reactivated, to your new Yahoo account.
https://support.google.com/plus/answer/1045580?hl=en

recovery by email:
https://support.google.com/accounts/answer/183726
Recovery email address You don't have to provide a recovery email address, but we strongly encourage you to. Once you've started using Google as a signed-in user, we'll use your recovery email address to communicate with you under the following circumstances:

• We need to confirm your username after you create an address
• You can't sign in to Google
• You've forgotten your password
• You're about to run out of storage space
• We need to alert you to any unusual activity involving your address

If you use Gmail, you may have added a recovery email address to your account when you first signed up. If you don't use Gmail, your password recovery address is the email address you used to sign up for your account (for example:[email protected])
To change or add a recovery address:

1. Go to your Google Account Settings page.
2. Scroll down to the "Signing in" box.
3. Click Recovery email.
4. Add your recovery email address.
5. Click Done.

Your recovery address should be an email address that you use regularly.


recovery by phone:
https://support.google.com/accounts/answer/183728

Having a mobile phone number on your account is one of the easiest and most reliable ways to help keep your account safe and ensure that you can get back into your account if your account is taken over or you forget your password. Your mobile phone is a more secure identification method than your recovery email address or a security question because, unlike the other two, you have physical possession of your mobile phone.
Hackers target accounts without phones because they're easier targets. Add a phone and join hundreds of millions of other Google users who have helped stop hackers in their tracks.

To add a recovery phone number to your account:

1. Go to your Google Account Settings page
2. In the Personal info section, click Phone.
3. In the Recovery phone section, click to add a recovery phone number if you don't have one yet.

Ways we will use your mobile phone number

We'll only use your mobile phone number to ensure the security of your account. Here are some ways we'll use it:

• To challenge people when they try to take ownership of your account
• To send you a verification code so you can get into your account if you ever lose access
• To provide an alternate way for you to verify that you own an account
• To help prevent people from getting into your account by guessing the answer to your security question
• Optional: To alert you to possible threats to your account's security (for example, when your password is changed)

Ways we won't use your mobile phone number

Unless you make a specific request, we won't use your mobile phone number for anything other than protecting your account. For example, unless you tell us to, we'll never:

• Sell your phone number to other companies or organizations
• Call you for marketing purposes
• Publish your phone number online

What type of phone you should use

You should use a mobile phone number so that you always have access to it. It's important that you can receive security alerts as soon as possible so that you can help keep your account safe.

Try your security question and answer. Try sending a reset email to your backup email account. Contact Google if that fails.

To reset your forgotten Gmail password:

• Make sure you either have a secondary email account specified for your gmail account or

• Follow the cant access your account? link from the Gmail log-in page.
• Make sure i forgot password is selected.
• Type your full Gmail email address under Email address.
• Click Continue.
• If you have set up a secondary email address for recovery:
  • Make sure the desired email address is selected following Get a password reset link at my recovery email: under Choose how to get back into your account..
  • Click Continue.
  • Open the Google Password Assistance message in the selected email account from Google Account Recovery.
  • Follow the link under To initiate the password reset process for your ___ Google Account.
• If you have set up a security question for Gmail password recovery:
  • Make sure Answer my security question is selected under Choose how to get back into your account..
  • Type the answer to your recovery question following the question.
• If you have set up phone number for account recovery:
  • Make sure the desired phone number is selected following Get a verification code (via SMS) on my phone: under Choose how to get back into your account..
  • Click Continue.
  • Open the SMS text message from Google that begins with Your Google verification code.
  • Type the verification code form the text message on the Google Account Recovery page under Enter that code here.
  • Click Continue.
• Enter the desired new password under both New password: and Re-enter password.
• Click Reset password.

If you have used your Gmail account in the past five days but have not specified a secondary email address, you'll have to wait for these five days to pass.