In ancient English, people called a woman who had never gotten married a sinister, but I'm positive using it is absolete today and perhaps many youths have no sense of in many English spoken regions! So how would you normally call such an old lady/woman?
Meanwhile, I need to find a (preferably informal) word to indicate the same situation for an old boy/man.
I'm not about virginity at all! The key concept is "marriage" here.
I was wondering if there is any (preferably informal) noun/adjective to describe it.