Help it's 2018 and I need to file 2013 taxes does the software available for the 2016 allow for 2013 taxes to be filed as well?

No. We no longer sell software for 2013 or earlier tax years. You can get the tax forms for 2013 or earlier tax years at this IRS web page.

From TurboTax FAQ:
https://ttlc.intuit.com/questions/1900990-how-do-i-file-a-prior-year-tax-return