I’m from Vietnam. I’ve been in the UK for 10 years now. When I met my English husband 13 years ago at 19 I knew 0 English. We communicated using machine translation. So that’s when I started learning English. Fast forward to present day after immersion, living in an English speaking country, formal study, etc. and I’d say my writing and listening (understanding) are good, but my speaking and reading are still bad. I kind of gave up on trying to become fluent at this point.
It’s also bullshit. My parents (both 50+) are both learning English right now. Of course they’ll never be close to native speakers. But they are absolutely able to communicate to get around, well beyond the basics too.
It doesn’t get easier. But it also doesn’t get impossible. Motivation is a big step towards it.
My in laws learned English in their seventies!