How can i calculate retirement date (Retirement_Date__c) by subtracting birthdate (birthdate) from retirement age (Retirement_Age__c).  I would like to breakout the birth date by years and months to make the retirement date more accurate.

I tried to write the formula and was getting an error

I am at the part of the challenge where it asks you to Update the Flow.  
1. In the Display Text component, click into the search box above the text box and then click New Resource.

I follow the steps to create the formula
Resource Type:  Formula
API Name created_or_updated
Data Type: Text
Formula:  IF({!Create_Contact}, "created", "updated")
However, when I click done, I get the following error
I cannot figure out what I am doing incorrectly.  I am sitting on the Display Text in the Confirm Screen.
Thank you.

I am at the part of the challenge where it asks you to Update the Flow.  
1. In the Display Text component, click into the search box above the text box and then click New Resource.

I follow the steps to create the formula
Resource Type:  Formula
API Name created_or_updated
Data Type: Text
Formula:  IF({!Create_Contact}, "created", "updated")
However, when I click done, I get the following error
I cannot figure out what I am doing incorrectly.  I am sitting on the Display Text in the Confirm Screen.
Thank you.

How can i calculate retirement date (Retirement_Date__c) by subtracting birthdate (birthdate) from retirement age (Retirement_Age__c).  I would like to breakout the birth date by years and months to make the retirement date more accurate.

I tried to write the formula and was getting an error