A moment in time: Putting your best foot forward

Two retirees (above) dressed in similar-looking suits dance to keep fit in Xi'an, Shaanxi province, in 1987. Fast forward to late 2015, and you have senior citizens (below) practicing ballroom dance steps in a park in Qingdao, Shandong province.

In recent years, as living standards have improved, you have the elderly enjoying life and even doing physical workouts together. The most common form of activity is the plaza dances, which though controversial offer a chance for seniors to exercise and expand their social circle.