Our results were comparable with those from UK and Canadian populations that suggested associations of older maternal age with improved child health outcomes in early childhood. Although delayed childbearing is an ongoing trend in East Asian countries and globally, its long-term consequences remain poorly understood. Therefore, our study adds to this scarce body of knowledge. However, more studies are needed to validate our findings in different cultural contexts and also explore the effect of older maternal and paternal age on other aspects, such as children’s cognitive and social development.