It just says "Today is 's Birthday" and this is only announced once on the midnight when obj and daily login etc... resets
It isn't a big deal it doesn't reveal your age. It just lets everyone know it is your birthday and whoever wasn't present in midnight wont see it so it isn't really that bothering.
Kinda split about it; it may not be that big of a thing but personal data is personal data. It's best we give people that choice, or at least warn them beforehand when setting up their birthday.
Maybe have an option and by default it's 0.
If you change it yourself to 1, then it will be shown in the chat when it's your birthday.