The age of the dancers ranges from young children to people in their 70's, with probably the majority being in their 40's and 50's. Some of the older clubs have been around for 50 years, so square and round dancing are not new developments by any means. However, there is a big difference in the structure of the clubs. In fact, the women outnumber the men by about 4 to 1. Simple, a lot of the women do the man's part.
Many women can dance both parts, but some women only know the man's part.
In any case, it's not considered a problem here. It's usual to change partners for every tip, and even married couples don't usually dance together more than once or twice per dance. Another difference is the way beginner classes are run. Most clubs hold a beginners class once a year and it is held on the normal club night. The majority of the clubs here dances at the Mainstream level.