Be 17 as of what date? When I use your calculator at https://turbotax.intuit.com/stimulus-check/
and enter "no- did not file 2018 return", (but if I had )"head of household", $1100 AGI, "no one claimed me as a dependent", would have claimed 1 dependent in 2018 (had I needed to file a tax return), and yes we have social security numbers. It calculates that I should have received $1200 this January, not the $600 I received.
