Seniors dance the night away

The strains of music fill the night air outside Shuangjing subway station. It's a weekday evening and retirement-age couples are gracefully dancing in what appears to be ballroom style.

The dancers, and there are scores of them, neatly glide through their steps, not perfectly, but with enough confidence to suggest a fair bit of practice.

The routine tonight is energetic, involving dips and swings, but it's no sweat for the elderly dancers, many of whom look a good deal fitter than people half their age.