Number of sessions by age group in google analytics - google-analytics

I am pivoting my GA data to view number of sessions by Device Category for each age group of my users. Here is a snapshot of my data:
Removing the age breakdown for this data, I can see there are actually 606,737 sessions from mobile device. But after age breakdown, I can see only 196,027.
I am aware that google doesn't track users who are below 18 yrs of age. Is the difference only because of this?

Demographic data is only available for subset of users and doesn't represent your overall traffic. Google Can not gather demographic information for users whose Device ID is unknown or they have no activity profile. You may find more information here

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Google analytics report by demographics by date

Google analytics report by demographics by date doesn't shows data for all age groups, while if I remove date it shows all age groups in GA demographics report, don't understand this behavior,
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.

Google Analitycs - Demographics

I just turn on demography, copy and insert tracking code in my head tags,
it showing when i use page but not show my gender and age,
it's need time ?
online users
demography
thanks.
Demographics data do not work in this way, they do not represent 100% of users and require reaching a certain threshold of data to be displayed.
Demographics and interests data may only be available for a subset of your users, and may not represent the overall composition of your traffic: Analytics cannot collect the demographics and interests information if the DoubleClick cookie or the Device Advertising ID is not present, or if no activity profile is included.
https://support.google.com/analytics/answer/2799357?hl=en
Example with test: https://www.analyticstraps.com/i-report-con-i-dati-demografici-non-tornano/

Why Google Analytics user count changes when adding Date dimension?

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?
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.

Is it possible to find age and gender of a specific user using Firebase Analytics in mobile app?

I have Firebase Analytics integrated into my mobile apps (Android and iOS). Every mobile user has a unique ID that is used to set up the Firebase SDK with.
Is it possible to find out age bucket and a gender of a specific user? I've been looking at User explorer on Google Analytics console but could not find a way to connect user ID and age/gender.
Is it possible to find out age bucket and gender for a specific user?
No. As per https://support.google.com/analytics/answer/2799357?hl=en#thresholds
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
So when you try to combine the User ID with demographics data, each row in your report contains info about only 1 user, which is below threshold, thus demographics data gets hidden.
If you need user-level precision for gender/age etc... with Firebase/GA, the 2 ways I see are:
ask users (eg date of birth field in their profile settings)
use an external data enrichment tool
You save that data against each User ID in user properties / custom dimensions so you can retrieve it at will.

Enable demographics in google analytics

My blogger website is linked to google analytics. Now I want to get demographics data I have enabled it in the settings but still, it is not giving any data about demographics
You may need to wait a few days, or longer; particularly if your site has a low volume of sessions per day. Google will not show you the data below a certain threshold as this becomes to close to revealing individuals by, for example, age, gender and location.
Read more here, particularly on data thresholds.

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