Why do people who study Buddhism have short life spans?

Once in Buddhism, it is as deep as the sea, and teenagers swim slowly. Short-lived That won't happen. I know three realms: listening to the Buddha's mouth and listening to the Buddha's heart, but they are all inseparable from the difference between thoughts and distractions. Nanwu means respect and submission. For example, the bodhisattva in Namco worships and obeys the heart and has Tibetan feelings and feelings; Amitabha's absence in the south, courtesy, obedience, obedience, Amitabha's pursuit of goodness and so on.

How long can ancient times last? The life span of this world is 100, and some dogs will live for more than ten years. It is incomprehensible that people can live to 100 years old.