Almost everyone has a supposing death-time apart from his definitive longavity. It means it is the time when you can die too and survive too, depending upon your karma, actions and remedies you have done. This is called un-timely or un-natural death or Akalmrityu or Alpamrityu. For example if someone has alife-span of 80 years, he can also have 1, 2 or more sensitive times when he can die un-maturely. For example he has Marakesh in 40th year. It mean it is mostly in his hands how he saves his life. If he acts good, collects good karma and has proper and timely remedies, he can survive this time. If he ignores or is unaware of it, he loses his life for example by accidents, by natural disaster, by black-magic or by animals or insects like by biting of snake. Now if he dies in 40 Years of age, his soul still has to be by around the place of death for rest 40 years. Mostly an astrologer can tell you when you have this possibility. If you are in this situation, do this Yagya but prefer a High Capacity Yagya to secure life faster and definitely.