Opening remarks: What is the answer to life?
Prologue: The days ahead are more precious than the past.

Chapter 1.
We didn't know we would live this long
: The Unexpected Age of Longevity: The Secret of Lifelong Active Service

- Style is not a luxury, it's an attitude.
Living and dying at full power is the ultimate longevity.
- If I had known I would live this long
- The power of small goals to lead the day
-Just live naturally

Chapter 2.
The Secret to a Happy Life Round 2
: What people who live better as they age have in common

-Why high school 'tops' die early
- A miracle created by angina and a herniated disc
-If you accept discomfort as a part of life
Life is a playground, enjoy each day.

Chapter 3.
Active life never ages
: The power of protecting the life and health of Homo Hundred

-It is human nature to work and challenge ourselves.
-Why the president of a firearms company became a janitor
- Erotic sculptures found in the Dalai Lama's inner chambers
-Work is a panacea that saves the brain.

Chapter 4.
Homo Hundred's 'Health Reconstruction'
: The health standards we have had so far are no longer adequate.

- Gray Syndrome is coming
- Big bottles start from small bottles
- We need to rebuild the foundation of health.
-What are the appropriate blood pressure, diabetes, and obesity standards for middle age?

Chapter 5.
Change your attitude and questions about health.
: Is my life in harmony with my health?

- Doctor of knowledge and doctor of wisdom
-Are you still looking for the royal road?
-The story of running with gravel at midnight
-Parking is far away! Welcome, stairs!
-If you have a partner to share your habits with

Chapter 6.
The three strengths that keep you active throughout your life: brainpower, physical strength, and immunity.
: Rebuilding the brain, body, and immune system to live 30 years younger

-5% of people in their 80s retain the brain function of a 40-year-old.
Why short poems called "haiku" are popular in Japan
-10 minutes a day, the power of meditation and prayer
-Sound body, sound mind
-What is your immune age?

Chapter 7.
Slow-Aging Health Secrets of Masters
: Every day is a 'training to live healthily without medication'

-Empty your stomach for 12 hours a day
-The right level of sustainable exercise
-Stress is the 'spice of life'
-No one has ever died from lack of sleep.

Chapter 8.
Dementia? Living with Cancer
: If you go back to basics, even severe illnesses can be seen as long-term.

- An era where dementia and cancer are also managed
-You can't live avoiding everything that's bad.
-It's good to gain weight vs. It's good to lose weight
-Do you really need nutritional supplements? vs. Do you not need them?
Walk 10,000 steps a day vs. You don't have to.

Chapter 9.
Challenge yourself, learn, and grow throughout your life.
: A person who wants to grow has a direction in life.

-From quantitative growth to qualitative growth
-The feeling that I can do it now
-Studying as you get older is real
-The first letter I wrote to my 60th birthday daughter
-For people with a purpose, every day is different.

Chapter 10.
A good life is completed by a 'good death'
: Well-dying is the final gift of a good life.

- Death is a mirror that reflects life.
- Prepare for death while you are healthy.
- The surgeon who said he would go to Switzerland to euthanize
- What kind of last moment do you dream of?

Epilogue_ Life and health, somehow, is the answer.

92-year-old psychiatrist Dr. Lee Si-hyung? 83-year-old national physician Dr. Yoon Bang-bu.
A conversation about health and life between two active doctors in their 80s and 90s.
“What is the secret to staying active even in old age?”
The Secret of an Ageless Brain and Body, and an Unwavering Mind

Today's 40-60 year olds are the so-called 'Homo-hundred', the first generation in human history to live to the age of 100.
Those who have both the responsibility and opportunity to live another 40 to 50 years after retirement must design and walk a second round of life path that did not exist in the past.
These people require not just simple life extension technology, but a completely different grammar of health and life.
"How to Live a Healthy Lifelong Active Life" is a book in which two masters answer the questions posed in this era of transition through their lives.
This is a record of a conversation held over three seasons between two active doctors in their 80s and 90s: Dr. Lee Si-hyung, a giant in the field of psychiatry, and Dr. Yoon Bang-bu, the founder of family medicine in Korea.
The advice of these two authors, who have walked the path of the 100-year era and proven it through their lives, serves as a compass to help you fill your extended life with living wisdom and practice, not vague anxiety and confusion.


“Aging begins when you stop working!”
How to live 30 years younger, as practiced by a 8090 active physician.

Dr. Lee Si-hyung, 92, and Dr. Yoon Bang-bu, 83, are still active doctors who are more passionate than anyone else.
Dr. Lee Si-hyung is the first doctor to talk about 'mental health' to the people of Korea, selling 2 million copies of 'Let's Live with Guts', and is a giant in the field of psychiatry who established 'hwabyung' as a global psychiatric term.
Even now, when I'm over ninety, I still go to work at the Serotonin Cultural Center every day.
He continues to give lectures across the country.
“I am happiest when I am speaking passionately enough to leave my breath gasping,” he says.


Dr. Yoon Bang-bu is the founder of family medicine in Korea, the first doctor to appear on television, and a renowned figure in preventive medicine who has long enjoyed the trust of the nation's doctor.
Even now, in his eighties, he still commutes to Cheonan Asan Medical Center by KTX, continues to work full-time five days a week, and engages in aerobic and strength training for three hours every day with the same intensity as someone in their 30s.


People ask:
“What is the secret to staying active even in old age?”
This book questions what it means to live an "active" life, and through that insight, redesigns the fundamentals of life and health.
The two authors emphasize that 'activeness' is the most powerful energy that delays aging and sustains life.
Active duty doesn't just mean having a job.
I define presence as a sense of having a role, being connected, and being needed by someone.
'Work' is not simply an economic activity, but rather a key element that creates the rhythm of the day and activates the brain, body, and mind simultaneously.
The two authors' health routines were ultimately possible within a work-centered life structure, demonstrating that active service is the driving force behind their health routines.


Every day is a 'training to live healthily without medicine'!
Meditation, exercise, and diet: Two masters' slow-aging health tips.

As many people reach middle age, they become confused about traditional health standards.
They are sensitive to blood pressure and cholesterol levels, and often try to diet excessively based on their weight when they were younger.
But both authors say:
The health standards of the past are no longer valid, and a new 'health reconstruction' is needed after middle age.
He emphasizes that we need to move away from health management centered on absolute numbers and find “a health method that suits me.”


The two authors have been personally practicing 'How to live healthily without drugs' for a long time.
It is literally ‘slow aging training every day.’
What's interesting is that the two men have different health philosophies.
Dr. Lee Si-hyung practices “eating less and moving less.”
Manage stress through meditation and enjoy one meal a day.
Continue a lifestyle that increases the neurotransmitter serotonin, such as walking, rhythmic exercise, sunlight exposure, and community activities.
On the other hand, Dr. Yoon Bang-bu maintains his health by “eating a lot and moving a lot.”
I enjoy eating hamburgers, drinking cola, and eating a lot of meat.
At the same time, maintain your body's balance by doing aerobic and strength training for 2 to 3 hours every day.
Although their methods are different, both people maintain their health without relying on medication or hospitals.
They have something in common.
It is about creating a practical routine and living it based on a deep understanding of your own body.


Rather than offering a single answer to questions like whether walking 10,000 steps a day is really necessary, whether you really need to take supplements, or whether dieting is right for everyone, this book helps readers find their own routine.
Health doesn't follow a formula.
It's important to create a customized routine that suits your body, your rhythm, and your constitution.
We often seek out medicine for our health, and we stock up on special foods or expensive supplements.
But for both authors, health is not something special, but rather the accumulated power created through daily habits and routines.
That is the life strategy that makes ‘slow aging’ possible.

Aging is not decline, it's a second growth.
Learning stimulates the brain and is a force that overcomes aging.

The latter part of the book covers how to design the second round of life, covering topics such as work, relationships, study, and death.
Many people close off their options as they reach middle age, thinking, “What more can I do now?”
But the two authors say, “There are things we can do now.”
Dr. Lee Si-hyung continues to write books, give lectures, study new fields, and write and read every day.
He emphasizes that “the brain becomes active when it has a goal,” and that working and learning are the best ways to keep the brain young.
Dr. Yoon Bang-bu also continues to interact with his juniors while conducting clinical trials, broadcasting, and giving lectures.
He says that while quantitative growth may slow down, qualitative growth never stops, and that the latter half of life is the time to learn and grow more seriously.


The two authors emphasize that while achievement and speed have been important until now, meaning and direction are now important.
New studies, small challenges, and efforts to develop my own philosophy.
That is precisely what drives the two authors to live a life that never ages.
In particular, the two authors say that death is 'the last question we must face in life.'
Because when you face death, life becomes clearer.
The habit of preparing for death makes people humble and enriches their lives.
Having witnessed countless deaths, the two men come to the conclusion that a good death is ultimately the final gift of a good life.


“How to Live a Healthy Life” is not just a health book.
This book answers the question, “How should we live our future lives?” by examining the lives of two masters.
The routine of life is a philosophy of self-preservation, and it shows that the ordinary daily life they practice is the key to an ageless life.
Rather than passively accepting aging, the two authors suggest ways to live a healthy and meaningful life.
Two doctors, each from different perspectives—psychiatry and family medicine—present a practical guide to life that blends medicine, philosophy, and experience.