Google Account Recovery : Gmail Password or Account recovery
We all have a lot of passwords to keep track of these days, and few are as important as your Gmail password. If you've forgotten your Gmail password, Google provides several options for recovering it.
If you've associated a phone number or alternate email address with your account, Google can quickly reset your password for you. If you don't have any other alternates, Google can attempt to verify your identity and recover your account.
If you have not accessed your account for 30 days or more, Gmail may have considered your account as abandoned and may have deleted it from the server. In this case, account recovery is no longer possible.
If you have forgotten your password and can no longer access your Gmail account, here are a few quick steps to recover your account.