I am over 60. I learned basic Spanish at 40, let it rust through disuse, and have been refreshing it the last few years, and learning a fourth language from scratch. I find it interesting.

I met a German man in his 60s who didn't speak  word of English until he retired, then learned English well enough to travel, which is why he learned it.  I met him on his, and my, travels...

It can be done. We may not become fluent, but we can learn enough to manage. It is more difficult when you are not immersed in the language, but immersion is the best way, so learning English in America is ideal, and getting a job where you have to speak English every day is one of the very best ways.