I learned Spanish as a kid/natively, and stopped speaking daily at 17. Now mid-30s, I've lost a significant chunk of my vocabulary, and there are adult topics o

I learned Spanish as a kid/natively, and stopped speaking daily at 17. Now mid-30s, I've lost a significant chunk of my vocabulary, and there are adult topics of conversation with vocab I haven't learned. But I went back to South America for work in 2009, and apparently I just sounded like someone from a different Latin country. Someone even asked if I was French.