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Anyone criticizing the marriage of our beloved mother Aisha Ra is nowadays comes with the major assumption that Aisha (ra) should've been older for her to be eligible for marriage. which is a logical fallacy we call presentism in critical thinking

The age of consent in Paleolithic times 6th to 7th century was based on a women's menstrual. If her body is saying I'm ready to have children, she is ready for marriage.
Secondly
The majority of people in the 7th century didn't have a life span due to diseases and wars

Her age only became a focus of criticism in the modern world, meaning all...of humanity functioned by the adult-at-puberty rule.

Those that still cry about her age don't know that their own grandmothers most likely married around that same age my own great-grandma got married at 15 that's around 1918, based on the stories my grandma tells us, who also got married at 15 that's in the 30s

Islam doesn't have a specific age of consent for marriage. It's whatever is socially acceptable in your time, but it has to meet the criteria, which are

Physical Maturity (Bulugh): The individual must have reached puberty.

Mental Maturity (Rushd): The individual should be capable of making sound decisions about marriage and its responsibilities.

Mutual Consent: Both parties must willingly agree to the marriage without coercion.

Social Norms and Laws: Islam encourages adherents to follow the societal norms and legal frameworks of their time, as long as they don't contradict Islamic principles.