After you file

Why do you need to amend 2016 (besides taking off the 2015 W2)?

You still might need to file a 2015 return.  Your age doesn’t matter.  You can do 2015 for freeon the blank forms.  Here are some blank forms & instructions for 2015
1040 <a rel="nofollow" target="_blank" href="https://www.irs.gov/pub/irs-prior/f1040--2015.pdf">https://www.irs.gov/pub/irs-prior/f1040--2015.pdf...
Instructions <a rel="nofollow" target="_blank" href="https://www.irs.gov/pub/irs-prior/i1040gi--2015.pdf">https://www.irs.gov/pub/irs-prior/i1040gi--2015...>

1040A <a rel="nofollow" target="_blank" href="https://www.irs.gov/pub/irs-prior/f1040a--2015.pdf">https://www.irs.gov/pub/irs-prior/f1040a--2015.p...
Instructions <a rel="nofollow" target="_blank" href="https://www.irs.gov/pub/irs-prior/i1040a--2015.pdf">https://www.irs.gov/pub/irs-prior/i1040a--2015.p...>

1040EZ <a rel="nofollow" target="_blank" href="https://www.irs.gov/pub/irs-prior/f1040ez--2015.pdf">https://www.irs.gov/pub/irs-prior/f1040ez--2015...
Instructions <a rel="nofollow" target="_blank" href="https://www.irs.gov/pub/irs-prior/i1040ez--2015.pdf">https://www.irs.gov/pub/irs-prior/i1040ez--2015...>

2015 Tax Tables <a rel="nofollow" target="_blank" href="https://www.irs.gov/pub/irs-prior/i1040tt--2015.pdf">https://www.irs.gov/pub/irs-prior/i1040tt--2015...>
Publication 17 Tax Guide for 2015 <a rel="nofollow" target="_blank" href="https://www.irs.gov/pub/irs-prior/p17--2015.pdf">https://www.irs.gov/pub/irs-prior/p17--2015.pdf</a>