(original image from http://www.iworldtoday.com/news/articleView.html?idxno=176220 and I re-edited this image in Keynote)
In most cases, ajummarous women are judged by their appearance.
–ajumma hair, fashion and make up style
–behaviours (way of talking, loud voice, sitting with their legs apart in the subway, being meddlesome)
Especially, they are being meddlesome. So if you are in the subway and sitting in the cafe or restaurants, ajummas keep talking to you and even asking some personal questions as well. Whenever I travel on the subway in Seoul, I heard ajummas’ conversations. Interestingly, these ajummas never met with each other before, rather they just met on the subway. Their conversations were about everything, such as cooking, children, weather, culture, politics, etc. It might be strange if strangers talk to you on the subway. However, this is their ways of communication which is very ajummarous ways of communication that exists only in Korea.
With one of these ajummarous elements (of course there are more ajummarous elements than I mentioned above), any women can be called or recognised as an ajumma in Korea.
Here are some photos that help you understand what ajummarous elements which define ajummas in general.