It sounds like you are asking about the $6,000 senior deduction. This is an additional deduction, not included with the standard deduction. This additional deduction for seniors is calculated automatically based on the birthday you have entered in your tax return.
Note, this deduction has income limitations. It begins phasing out at income of $75,000 for a single filer (or $150,000 married) and is completely phased out at income of $175,000 for a single filer (or $250,000 married).
This deduction is located on Schedule 1-A Additional Deductions, Part V. The total additional deductions will be summed and appear on your 1040, line 13b.
You can check this in TurboTax Online by navigating to Tax Tools on the left of your screen, choose Tools, then View Tax Summary. On the left of the screen, select Preview my 1040, and scroll to Schedule 1-A Part V.
