How do I access my tax documents from the years 2014 and below?

TurboTax only retains online tax return for the past 7 years, the same retention period as the IRS.

Is there a way I access my 2014 tax documents?

since 2014 is more than 7 year's ago, records for that and prior years have been permanently deleted. 

@professorrli As the reply above your post explained, TurboTax and the IRS save returns for seven years.  After seven years they are gone.   You *might* be able to get an IRS transcript for 2014 but it will not look like a tax return.

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

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@professorrli wrote:

Is there a way I access my 2014 tax documents?

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You can access a Tax Account transcript of your 2014 tax return from the IRS - https://www.irs.gov/individuals/transcript-types-and-ways-to-order-them

Neither the IRS nor TurboTax will have a copy of the 2014 tax return.