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.
https://support.google.com/analytics/answer/2799357?hl=en
In conclusion, it is not always possible to obtain demographic data with granular detail in Google Analytics reports. This is due to both user privacy issues and the fact that these data, based on a portion of total users, are found in the database of the analysis platform within dedicated tables and with pre-aggregated values.
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