Yes. And part of adulting is setting standards even when we cannot answer the question.
When does a child suddenly become capable of informed, consensual sex? Who knows.
When does a fetus become 100% certainly nonviable? Only once it already dies. Yet we let mothers abort fetuses that likely are not viable. As we should. What is the "cutoff percentage"? There isn't one.
At what point is it more likely that both mother and fetus die, than one of them surviving? Nobody knows. Yet we let mothers abort pregnancies that could kill them.