Or a second language later in life while trying to achieve a native sounding accent. Yeah, you can sound fluent just fine. My complaint with brain plasticity with age and language learning is that… well… when you’re younger you have more _time_ to learn something and are less burdened by chores, work, obligations, kids, and so on.

Turns out that if you use the language as much as a native person, with special attention to accent development, you can achieve high proficiency just fine.