Why the marriage age of girl is 18 and that of boy is 21?

The marriage age difference, with girls typically allowed to marry at 18 and boys at 21, is often rooted in cultural, social, and historical norms. This distinction reflects traditional views on gender roles, where men are expected to be more financially stable and mature before taking on the responsibilities of marriage. Additionally, these age limits aim to protect young women, ensuring they are mature enough to make significant life choices. Ultimately, these legal standards can vary by country and are influenced by societal values regarding gender and family.