Turbo Tax is giving me a message "a friendly reminder about your retirement" saying we are getting close to retirement... but we are already retired and 78 years of age.

You may be reporting a current job

I only have ssa , pension , and 401k income so that’s not it.

what date did you enter for yours and your spouse's birthdate ?

6/1/1939 and 6/4/1942

I suggest you ignore the "friendly reminder".