Why Google Analytics user count changes when adding Date dimension?

Question

After spending too much on Power BI trying to see why my user count didn't match when querying userAgeBracket, I used https://ga-dev-tools.appspot.com/query-explorer/ and here is the output:

start-date is 2019-11-01. end-date is 2019-11-30.

Without Date (Notice there are users with age 55-64 and 65+):

When adding Date dimension:

Notice there are now no users with age 55-64 and 65+.

How can I solve this?

Answer 1

As the documentation says:

Thresholds are applied to prevent anyone viewing a report from inferring the demographics or interests of individual users. When a report contains Age, Gender, or Interest Category (as a primary or secondary dimension, or as part of an applied segment), a threshold may be applied and some data may be withheld from the report. For example, if there are fewer than N instances of Gender=male in a report, then data for the male value may be withheld.

So you won't be able in some cases to get granular demographics data in GA reports.