A survey of people working as professional interpreters would show that 80% of them graduated from less than five universities in the world.
None of them were children.
In conclusion, my theory is if an adult and a child attend the same number of hours of classes, the adult will learn faster. In practice, however, adults have lives. They are busy people, and studying is a kind of luxury, which generally takes second place to work and earning money and taking care of their family.
However, given the same number of hours of classes, an adult would learn a language faster than a child. The proof is Monterey Institute, Defense Language Institute, and Middlebury Language Program, all of which can take an adult student from zero to passing a college entrance exam in a foreign language in just one to two years.
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