To recover your Facebook password using an old password, go to the Facebook login page and click on "Forgotten password?". Enter the email address or phone number linked to your account. Facebook will send a password reset link to your email or phone. During the recovery process, if you remember an old password, try entering it when prompted. If it is still accepted, you’ll regain access to your account. If the old password doesn’t work, follow the instructions to reset it. You can also use alternate recovery options like trusted contacts or a recovery email for further assistance.