How did Namikaze Minato and his wife die? How old was Naruto when he died?

Watergate's wife, Naruto's mother, is the pillar of strength. Kyubi no Youko was sealed in her body before, and Uchibo Shoko Asahara took Kyubi no Youko out of Naruto's mother's body in order to get Kyubi no Youko. She just gave birth to Naruto and killed Kyubi no Youko, so she died. Watergate was hung, sealing Kyubi no Youko in Naruto's body. What's the name of that trick? It was also used during the Three Generations War in orochimaru. This is a sealing technology. Naruto died less than a day after he was born.