Is this an error?

[Alissa Nesson]

Hey all, just wondering if someone can help me. This sentence seems wrong, like it should say “a mustache” and not just “mustache”. If the author is trying to say the hair and the mustache were both curly and gray, I still think this would be incorrect. Thoughts?

He was very tall with gray, curly hair and mustache

[Shirley Ann Riddern Labzentis]

I wouldn't blame the author for an error because it is okay either way. It sounds better to say "a mustache," but "mustache" is also correct.

[Alissa Nesson]

Thank you very much