At some point in my life I had to claim to be born a lot earlier than I really was. Steam used to think I'm in my 80s. Now that I really am old enough to look at whatever content I want, I usually end up selecting some year much younger than myself, like 2002.
They absolutely include 1900 as the "we aren't tracking other info" option. Or they are least use other means to determine your age.
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