they have already done this for at least the last year or so easily. I noticed it when I requested by data package last year, theres a clear area on it that infers both your gender and your age in it.

They are just acting like this is a "new system" but in reality its a system that have had for awhile now, just didn't have any public facing usage of it.

For anyone else that wants to see it themselves, and they have a discord takeout. its located at the very bottom in the events file in activity/analytics.

the end of the file shows json objects that indicate what your predicted age and gender is.

edit: I found this file isn't a static location, it is still in the activity/analytics directory in one of your event files, but you need to search "age" or "gender" to find it if it isn't at the bottom