TurboTax automatically prints Form 1040-SR if you are 65 or older. Since you are using the CD/Download TurboTax software, you can make it print Form 1040 instead. Go to forms mode and open the Federal Information Worksheet. In Part II of the worksheet, below your address, there is a line that says "Print Form 1040-SR instead of Form 1040." Click the No box on that line.
Note that the only difference between Form 1040-SR and Form 1040 is the appearance of the printed form. The calculations are exactly the same. Changing the form will not make any difference in your tax.
