BOTH spouses had to be 65 or older during 2019.  Check their birthdates entered on the My Info page if that was true. 

(or, one could be age 65 or older, and the other younger but legally blind

or one could be age 65/older and legally blind....but the blind part needs to be set in the interview if that is the case)

We are 83 and 79, birthdays were correctly entered, so what is happening?

But..did you actually edit each person in the My Info page to ensure the bDays were entered properly?

I tried two 65 year olds (in 2019, just in case there was one-year off in the calculation ) in a test file...and it worked just fine  (at least on the Desktop software, I don't have a two-person Online test file with that situation (yet)) )

I tried an 84 yo Hubby, 78 yo spouse in an Online test account...no problem:

IF you have not found an BDay entry error, Check with Customer Support.  They can get a Diagnostic file from your tax file, and see what's happening:

https://ttlc.intuit.com/community/using-turbotax/help/what-is-the-turbotax-phone-number/00/25632