How to enjoy your old age? Listen to this 80-year-old foreign grandfather.

Believe me, good genes only account for about 20% of your life span. The remaining 80% is entirely up to you.

Believe me, good genes only account for 20% of your life span. The remaining 80% is entirely up to you.

This is hard work, and you must start thinking and acting in your twenties. That's when you start to lose your bones and muscles. At this time, your metabolism will slow down, and you can easily gain weight in all the wrong places.

This is hard work. You must start thinking and acting in your twenties. At this time, your bones and muscles begin to lose. At this time, your metabolism will slow down, and it is easy for you to gain weight where you shouldn't.

I was lucky to grow up in sports. I have been playing basketball, baseball, squash and tennis since I was in my twenties (I don't count golf as a sport).

Fortunately, I grew up in sports. I have been playing basketball, baseball, squash and tennis since I was in my twenties (I don't think golf is a sport).

After I was 60, I had to give up basketball and baseball. I only concentrate on tennis. At that time, I started a calorie-restricted diet, not eating a meal every day, or fasting 17 hours every day.

After I was 60, I had to give up basketball and baseball. I only concentrate on tennis. Since then, I have started a calorie-restricted diet, eating only one meal a day or fasting 17 hours.

After the age of 65, I realized that if I want to stay competitive and healthy, I need to cross-train in the gym. IMO resistance training really slows down the aging process.

After the age of 65, I realized that if I want to stay competitive and healthy, I need to cross-train in the gym.

After 70 years old, I decided to give up soft drinks, alcohol, bread, salt, sugar, caffeine and most animal proteins. I began to take better care of my dental health (which is very important at any age).

After 70 years old, I decided to give up soft drinks, alcohol, bread, salt, sugar, caffeine and most animal proteins. I began to pay more attention to my dental health (which is very important at any age).

After 75 years old, I added interval training to my daily exercise. At that time, I began to supplement nutrition to protect my intestinal bacteria.

After 75 years old, I joined interval training in my daily exercise. At that time, I started taking vitamins to protect intestinal bacteria.

Now I am 80 years old. I spend two hours on the tennis court and two hours in the gym every day. I promise to sleep at least seven hours every night. I write novels and nonfiction, and continue to work, so that I can keep my goal in life. My wife and I are very active socially, and we have both successfully learned how to cope with stress (at least we think so).

Now I am 80 years old. I spend 2 hours in the tennis court and 2 hours in the gym every day. I promise to sleep at least seven hours every night. I write novels and non-fiction books and continue to work, which gives my life a purpose. My wife and I are very active socially, and we have both successfully learned how to cope with stress (at least we think so).

We have no plan to live forever (neither do we), but when we are here, we hope to live a healthy, active and disease-free life.

We don't intend to live forever (nor do we want to), but since we live in the world, we want to live a healthy, energetic and disease-free life.

My last comment is that whatever you can do for your heart is good for your brain. Personally, I find that playing video games is good for my brain.

Finally, I want to say that what you do is good for your heart and good for your brain. Personally, I find that playing video games is good for my brain.

At the gym last month. My weight and waistline are exactly the same as when I graduated from high school. More importantly, I am a healthy and disease-free senior.

At the gym last month. My weight and waistline are exactly the same as when I graduated from high school. More importantly, I am a health of the elderly who is not troubled by diseases.