If you need help resetting your Google mail account password, Google account helper can help you by sending a password reset.
Visit Forgot Google Account Password Page
Enter your recovery email address
Check your recovery email inbox for a password reset link
Click on the password reset URL provided by the Google account helper team in your alternative or recovery mail address.
Now you can easily change your password to get access to your old Google account with the help of https //g.co/recover page.