Turbotax said I should take Single standard deduction, but entered $13,600 on line 8 instead of $12,000, and no Schedule A. I already filed. What should I do?

That is the 2018 Standard deduction for age 65+

You are an angel. Thank you so much!

2018 Standard Deductions:

Single   $12,000  (+ $1600 65 or older)

Married Filing Separately    $12,000  (+ $1300 65 or older)

Married Filing Jointly  $24,000  (+ $1300 each spouse 65 or older)

Head of Household  $18,000  (+ $1600 65 or older)

Look at line 8 of your Form 1040 to see your standard or itemized deductions.