No one is physically or psychologically mature enough to be married at age 9

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Not anymore, they’re not. We live in different times where childhood is prolonged and even after puberty, there’s a long teen period and even in 20s, young adults are quite immature.

This was not the case a few centuries ago. Boys and girls matured both physically and psychologically much earlier.

Puberty often occurred between 9-11 years old, and reaching this stage meant a girl was considered physically and socially ready for marriage, as average life expectancy was much lower. Marriage at puberty was a norm across many cultures.

Now that puberty and psychological maturity is delayed, also not a social norm, one needs to wait before they get married.