If you are a Boltzman brain then you are born with memories you have (that haven't really happened) and you have no future (because the next moment you'll collapse).
You could even live kind of a "life" by randomly popping into existence once every million years in some differrent galaxy, experiencing one planck time and collapsing (and the only thing that connects the instances to each other is that the next instance by random chance has memories consistent with the previous instance).
They could even appear in non-chronological order.
I don't think it's likely, but it's more likely than having the one randomly generated brain experience stuff "in real time".
You could even live kind of a "life" by randomly popping into existence once every million years in some differrent galaxy, experiencing one planck time and collapsing (and the only thing that connects the instances to each other is that the next instance by random chance has memories consistent with the previous instance).
They could even appear in non-chronological order.
I don't think it's likely, but it's more likely than having the one randomly generated brain experience stuff "in real time".