In old times, life used be said as short as 50 years. But, now became an era of 80. But, without depending on a doctor, it's true some people who living long and forever young are increasing even developing medicine. The one of reasons is maybe many information stimulating to refresh them after another, not likely the old times. How mental source concerns with human health and life is proved like that a daily newspaper reader is hard to dote, or overwhelming many people who got a retirement have died within a year. From several thousands years ago ancient times, people had been seeking an elixir of life around the world, but, lately the secret has shown in the area of mind unexpectedly. Most terrible thing is maybe mentally aging. There are many surprises in our world. When a human becomes to feel nothing and have no surprise, it's like dead even having a life. Like a feeling of interest or fun, all pleasure of expressions come with a surprise. Human is moved or impressed by a surprise. And whether arts or literature, it values as "alive" when only got a surprise. Probably youthfulness means to be honestly impressed having surprise about everything. The youthfulness has another mean too. That's a will to challenge against something with passion. It should become a special and best medicine for body coursing an eternal youth and longevity to activate cells.

Over 80% of illness have diagnosis to concern with mental except infectious one. Why mankind couldn't have an awareness that the study of true mean of mental youth can get an eternal youth and longevity?