Response Age Cohort is calculated as the difference in days between Created At Date and the date of the response.
Let's use an example.
On June 30, an in-app survey appears for a user. They decline it. With this decline you pass the date the user was created in your app, in this example, June 1st. June 1st we store as the user's Created At Date .
30 days later (July 30), the user again gets shown the survey. This time they respond. We take the date of this response, subtract it from the Created At Date, and get the Response Age Cohort (Days). For this response, it's 60 days.
If you wish to do any cohort analysis, you'll know the approximate age of your users at the time of the survey.
FAQ
How do you determine "Created At Date"?
The Created At Date is what you pass to us as the date the user was created in your app. In other words, their sign-up date. If you do not pass us a date, the user will have no Created At Date.
Why does a response not have a "Response Age Cohort (Days)"?
This probably means the user does not have a Created At Date. Once they do, the Response Age Cohort (Days) will be calculated. You can send along created_at as a response property when sending along a survey. Learn more in the Wootric Documentation here.