Use the account recovery tool below, it'll have you access the old account through alternate methods even if you lost the old email. Choose the Try Something Else, and then it will ask for account specifics to help log you in:
https://myturbotax.intuit.com/account-recovery/
Another option is submitting an Extension if you know you're not going to file on time:
https://ttlc.intuit.com/replies/3931358
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