If he has no vital signs at his age, he's dead. Very few people make it back from CPR, and if they do they're usually going to suffer serious consequences for the rest of their life from it.
Maybe it is just misreported or miscommunicated so far. We'll probably know within a day.
The Japanese word 心肺停止 usually just mean he is not clinically dead, as only doctor can do that.
As numerous news services are reporting (e.g., the account I heard a minute ago on BBC World Service, also The Guardian, BBC's website, NY Times), as well as numerous comments in this thread, it's noted that "cardiac arrest" is often used to describe a patient/victim who has not yet been officially declared dead, but would be very likely to not be in a recoverable condition.
It's a very grave state in any event.
Still, not declared dead. It doesn't look hopeful, though.