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Lao Laizi is usually considered to be smart, which may be related to factors such as parents' rich parenting experience and sufficient family resources. However, intellectual development is affected by genetics, education, environment and other factors, and is not an absolute phenomenon.

Older parents tend to have more mature and stable economic conditions and psychological status, and can provide their children with better educational resources and emotional support. This type of family usually pays more attention to early education investment, such as purchasing educational toys, arranging parent-child reading time, choosing high-quality preschool education institutions, etc. From a biological perspective, some studies have shown that the increased probability of sperm mutations in older fathers may bring about certain cognitive advantage genes, but such mutations also have health risks. In terms of social environment, older children often receive more family attention, and interactions with older siblings or relatives can also stimulate intellectual development.

We need to be wary of the cognitive bias of generalizing individual phenomena. There are significant individual differences in intellectual performance, and some older children may suffer from developmental delays and other problems, which is related to the increased risk of chromosomal abnormalities caused by the decline of their parents' reproductive function. Factors such as pregnancy complications in older mothers and reduced sperm quality in the father may increase the probability of abnormal development of the fetal nervous system. The so-called smart phenomenon is more likely to be survivor bias-old people who perform well are more likely to be spread and discussed.

Regardless of childbearing age, ensuring children’s intellectual development requires creating a stable growth environment. It is recommended that parents conduct regular developmental assessments, supplement DHA and other intellectual nutrients through a balanced diet, maintain moderate parent-child interactive games, and avoid excessive comparisons of children's performance. If significant delays in language, motor, or social skills are found, professional pediatric guidance should be sought promptly rather than attributed to childbearing age.