At least some things are easier for (most) children than for (most) adults. For example, most adults will have to work very hard to speak a foreign language without an accent. Children who were exposed to a second language, even if they don’t speak it for years, will be able to pronounce it correctly later. See this.
I suspect some grammatical structures are also harder to acquire later, given how hard it is for adults to learn syntax elements that don’t exist in their native language (see the stereotype about foreigners always forgetting “the” in English).
At least some things are easier for (most) children than for (most) adults. For example, most adults will have to work very hard to speak a foreign language without an accent. Children who were exposed to a second language, even if they don’t speak it for years, will be able to pronounce it correctly later. See this.
I suspect some grammatical structures are also harder to acquire later, given how hard it is for adults to learn syntax elements that don’t exist in their native language (see the stereotype about foreigners always forgetting “the” in English).