Since a birthday can be checked through various lines of inquiry (social media, personal acquaintances, family members), then it is a claim that be checked to shown as fact. So it becomes a fact.
If you tell me you lived in an apartment, on the face value of how Americans live, I would take that claim at face value since there is a lot of evidence to support such a claim. There is indirect evidence to say that your claim could very well be a fact.
If someone says that they had a Near Death Experience that only they experienced and cannot be substantiated by anyone apart from them going "Oh, Ol' Joe down the road had an near death experience when he got hit by a car that time a few years back. That was weird", that is just a claim, since there is no way to independently verify that the claim of Ol' Joe having an NDE is a fact.
Do you see why the first two claims can be accepted as facts but the third one cannot? It's very simple: you need evidence for a claim to become a fact. And you have no evidence for a supernatural cause being behind NDEs. If you don't have evidence, it's just a claim.