So first of all, I personally think why men feel very tired at the age of 40, because the burden is heavy, old and young, economic energy and psychological burden are heavy, and they can't afford to lose.

There are not so many young people in the future, the cost of trial and error is higher, the body is declining, and the physical strength is not as good as before. After the age of 40, people still have to eat more money, rely on the accumulation of previous contacts, experience, knowledge and money, compete with young people on an equal footing, and fight for time, energy and physical strength. I'm sure I can't fight, of course I'll feel very tired.

Difficulties and pressures don't know where the answer is, or it takes too much time and energy to know the answer, which is why men feel tired at the age of 40.