Can I access tax return from over 10 years ago?

TurboTax and the IRS save tax returns for seven years.  The IRS might have a transcript from 10 years ago, but it will not be like a copy of the tax return.

https://www.irs.gov/individuals/get-transcript

No, TurboTax keeps 7 years of tax returns.  Tax Return Access: Included with all TurboTax Free Edition, Deluxe, Premier, Self-Employed, TurboTax Live, TurboTax Live Full Service customers and access to up to the prior seven years of tax returns we have on file for you is available through 12/31/2024.

No.  TurboTax only retains online tax returns for the past 7 years, the same retention period as the IRS.