She grew up to be 80 years old


She grew up to be 80 years old.
-> is this a wrong sentence in grammar or in content?

If it’s a right sentence, I’d also like to know what the sentence means exactly.

Thanks a lot.

This sounds strange to me. You can say “She lived to be 80 (years old)”. This may be understood to mean that she died before reaching 81. Alternatively, if you do not know exactly how long she lived, but know that it was at least 80 years (but less than 90), you can say “She lived into her 80s”.

Thank you very much ^^
The sentence was in an English book. so the book has an error!
Thank you again!