[faceplanted]

Based on my understanding, children have a much easier time for several reasons, none of which are inherent to being children, but are extremely common among children, specifically.

* Massive amounts of input data (Just all over the place) * Involuntary immersion (Your parents can just choose not to speak to you in your first language, a shop teacher can't) * Contextual examples (people very clearly pointing at things and labelling stuff when they use language) * 1 on 1 tutelage (This one is super important and extremely expensive for adults)

An adult given this situation willingly will learn a language extremely quickly.

The biggest argument against young people learning languages more easily than adults is the learning outcomes of children without bilingual parents in school language classes.