Middle-aged men are the most likely to give advance warning, are the most likely to carry through with that plan, and have the highest completion rate, after doctors.
Also, suicide is more common in Japan, and viewed differently by Japanese society:
"Suicide has never been criminalized in Japan. Japanese society's attitude toward suicide has been termed "tolerant", and on many occasions a suicide is seen as a morally responsible action."
Basically, middle-aged guy says he's going to commit suicide, that's one where you have to prove he won't. If he walked into the ER while I'm on, he's getting admitted.
