人間の人生は、80歳くらいです。長生きの人は90歳くらいまで生きますが、健康に働けるのは70歳くらいが限度でしょう。

そして、大学や大学院まで行くとなると、働ける年数は、38〜48年くらいです。長いようで、意外と短いです。なぜならば、人間は、いくつも専門性を持つのは難しいからです。せいぜい、2つか、多くても3つでしょうか？

そのため、職業として選べるのは、一つ、頑張って二つ（副業など）だと思います。

連続起業家？そんなものは、限られたエリート、天才だけですよ。あと、彼らも専門性がいくつもあるわけではないと思います。彼らは発想力とカリスマ性がすごいだけです。全部自分でやるのではなく、ビジネスモデルを考えて、カリスマ性で資金調達して、あとは他の人に仕事を任せている、委任していると思います。

なので、専門性をいくつも持とうとしては駄目だと思います。全て中途半端になりそうです。自分の武器を二つくらい持って、それを活用してカリスマ性を得るところまでいけば、連続起業家も可能かもしれません。しかし、そのためには、人との信頼関係、人から好かれる才能が必要でしょうね。

The Limitation of Life and the Importance of Expertise

Humans are finite beings. We have a limited amount of time to live and work. This limitation has important implications for our lives, especially in terms of our careers and our goals.

One of the most important implications of the limitation of life is that we must be selective about our goals. We cannot do everything, so we must choose the things that are most important to us. This is especially true when it comes to our careers. We must choose a career that we are passionate about and that we are willing to dedicate ourselves to.

Another implication of the limitation of life is that we must be realistic about our expectations. We cannot expect to become experts in everything. It takes time and effort to develop expertise in any field. Therefore, we should focus on developing expertise in a few areas that are important to us.

The limitation of life also has implications for our views on success. We should not define success solely in terms of material wealth or fame. Success can be found in many different things, such as making a difference in the world, achieving personal growth, or simply living a happy and fulfilling life.

In conclusion, the limitation of life is a reality that we must all face. By being selective about our goals, realistic about our expectations, and focusing on our values, we can live a more fulfilling and meaningful life.

Additional Thoughts

In addition to the points made in the essay, I would like to add that the limitation of life can also be a source of motivation. The fact that we have a limited amount of time can make us more determined to achieve our goals and live a meaningful life. It can also help us to appreciate the time we have and to make the most of it.

I believe that the limitation of life is a gift. It gives us the opportunity to focus on what is truly important and to live a life that is full of meaning and purpose.