Can I access older returns if I haven't used turbo in several years?

Many people have multiple TT accounts and forget how to access them.  Log out of the account you are in now.

Account recovery

https://myturbotax.intuit.com/account-recovery/

https://ttlc.intuit.com/questions/1901535-forgot-your-turbotax-online-user-id-or-password

Or did you use the desktop version of TurboTax?  If so, the files are on your own hard drive or any backup device you used like a flash drive.

https://ttlc.intuit.com/questions/1901486-how-many-turbotax-accounts-do-i-have

https://ttlc.intuit.com/questions/1901535

https://ttlc.intuit.com/questions/1901659-find-your-tax-data-file-in-mac

https://ttlc.intuit.com/questions/1900721-find-your-tax-data-file-tax-file-in-windows

To get a copy of your previously filed returns prepared with online TurboTax https://ttlc.intuit.com/questions/1900748-how-do-i-get-a-copy-of-a-return-i-filed-in-turbotax-online

@pmc0 

"Online" tax software only

1)  IF you ARE in the correct account, the "Tax Home" selection doesn't show up unless you get several steps into starting a 2021 tax return. 

2)  Just starting a 2021 file does not commit you to actually filing using the 2021 software  ( if you've already filed 2021 elsewhere).

3)  If you haven't used a paid version of the "Online" software for more than a year, I don't know if it would allow you to download those prior year files.  I'm not sure what TTX's policy is on that.  You might have to pay for the 2021 Online software before full access to those older Online files would be allowed...but you'll see when you attempt to download any of them.

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4) finally....if you use the "Desktop" software in those prior years...they aren't online at all...they would only be on the computer you prepared them on...or any backups you saved.