I really love English and when I was a girl I knew by hart all of the songs of THE BEATLES with nearly perfect pronunciation, but I ignored the meaning of the words, but now it’s better having studied a bit.
It’s true that children learn a foreign language more easily, their brains are like sponges, able to absorb “knowledge” in a very surprising way, but as adults we should never say “I’m too old to study”. We often hear:”I’m good at grammar, but I can’t memorize words”, at this point I can recommend a Latin proverb:”Repetitio est mater studiorum”, if you make mistakes, do nothing, they’re part of learning, the errors aren’t stumbling blocks, but the bridge that takes us forward.