Book (Practical) Social science 87 years old. I'm in my best working life.

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Social Science
The 87-year-old author continues to commute every day by train. The reason is that working is purely "fun." Before retirement, he wanted to lead a leisurely life as soon as possible, but what inspired him to find it interesting? It is said that life is 100 years, and working after retirement is becoming a matter of course. This book teaches you the secrets of work, money, health, and human relationships to enjoy the latter half of life.