The clue did not refer to an old ill-tempered woman, just itw.
Presumably a 30 year old could be called an old bag by this crossword compiler.
Okay, maybe I'm lacking a sense of humour but which of us would not feel annoyed if, say, someone said 'shut up you old bag' in response to a complaint or criticism?
Sense of humour alert? If they`re going to post us as old bags lets really go for! Might as well be hung for a sheep as a lamb. I plan to be a really awkward old cow today. Will probably get away with it too. Advanced age has its benefits