If you are 65 or older the form that you print out will be a 1040SR---which is identical to the form 1040 but with larger print. All the lines are the same; all the calculations are the same.
And...yes you will be using a 1040 if you have a 1099 of any kind. There are almost two dozen kinds of 1099's---what kind do you have? 1099R? 1099G? 1099B? SSA1099? 1099NEC? 1099DIV? etc etc etc.
A 1040 is the tax return form you prepare here to send to the IRS. If you start entering data in this software you are preparing a Form 1040. Please look at it so you will know what you are sending to the IRS:
PREVIEW 1040
https://ttlc.intuit.com/questions/1901539-how-do-i-preview-my-turbotax-online-return-before-filing
Click on Tax Tools on the left side of the screen. Click on Tools. Click on View Tax Summary. Click on Preview my 1040 on the left side of the screen.
**Disclaimer: Every effort has been made to offer the most correct information possible. The poster disclaims any legal responsibility for the accuracy of the information that is contained in this post.**
