Modern medical studies have concluded that men over 40 years of age are 50% less likely to impregnate a female partner within 1 year compared to men over 25 years of age; men over 25 years of age take longer (about 6 times longer) to impregnate a female partner than men over 25 years of age. Similarly, the negative impact of age (age) on female fertility is even greater! 1. At the age of 35, women’s fertility decreases to 50% of that of 25 years old; 2. At the age of 38, it decreases to only 25%; 3. At the age of 40 and above, it is less than 5%; 4. At the age of 45 and above, even if IVF is done, its success rate is almost 0. It is a common social phenomenon that modern young people, in order to fight for their career, generally miss the best age for marriage (25 years old). It is a common social phenomenon that we must respect the natural physiological laws and the natural laws of life.