If someone asks for my birthday I tell them they can have it, I'll get a newer one.
OR
"Jan. 0, 0000, or so Mom said. I was very young when I born so I have to take her word for it." (Date redacted 'cause I don't trust you, you and you.)
OR
"Jan. 0, 0000, or so Mom said. I was very young when I born so I have to take her word for it." (Date redacted 'cause I don't trust you, you and you.)