How is the Birthday field kept private from other users? When is the display field Age changed? Is it changed just on the first of each month or randomly within an random range of Birthday? Original SO question
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It's always seemed strange to me that the field exists at all. After all, if age, why not race, sex, politcval affilation etc? I have no problem about people knowing my age , and have mentioned it in several of my SO posts, but its presence in the profile is a bit peculiar.
I can't speak conclusively, but I know that the age in my SO profile rolled over, as expected, on my birthday. I suppose someone could scan the SO profiles daily and record the ages, then identify someone's birthday by when they change, but if someone wants to know that badly, I guess they can know. If you're really concerned about your privacy, don't put in your real birthday (or don't put one in at all).
Also, either intentionally or unintentionally, the user ages provided in the data dump aren't always accurate. I suspect that it's (current year)-(birth year), which leads to an age in the dump (22, in my case) that's 1 more than the user's actual age (I'm actually 21).