Need my last 5 years tax (income) for social security

Did you file tax returns for those years?  Your income was reported to Social Security if you received W-2's from an employer.

https://ttlc.intuit.com/questions/3355524-when-does-access-to-my-prior-year-turbotax-online-returns-expire

https://ttlc.intuit.com/questions/3404575-how-do-i-access-my-prior-year-2017-return

You can get a free transcript from the IRS:   Request a Wage and Income Transcript

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

How do I get a copy of a return I filed using online TurboTax?

https://ttlc.intuit.com/questions/1900748

How do I get a copy of a return I prepared using desktop TurboTax?

https://ttlc.intuit.com/questions/1900639

your needs don't seem to be in excess of wht theSSA requests.

here's the link for info required if filing online

if you have filed tax returns the SSA admin should have the info the the 2 years required

https://www.ssa.gov/hlp/radr/10/ovw001-checklist.pdf

if you are making a visit to SSA to sign up here's the checklist

https://www.ssa.gov/disability/Documents/Checklist%20-%20Adult.pdf

and here's the other medical and job worksheet

https://www.ssa.gov/disability/Documents/SSA-3381.pdf

if you used Turbo Tax online you can print the 5 years of return  for a fee

or

if you used desktop and save the .tax20xx files or pdf's of them you can print them out for free

or 

you can use IRS form 4506 to request copies of the returns - don't know if transcripts would be adequate thry can be obtained thru an online request or by filing form 4506-t.