Seniors climb Sheshan Mountain in Songjiang district, Shanghai on Oct 7. [Photo/WeChat Account: sheshanlvyoutopnews]

Hundreds?of Shanghai's elderly residents ascended Sheshan Mountain in Shanghai Sheshan National Tourist Resort to celebrate the Chongyang Festival, or Double Ninth Festival, which takes place on the ninth day of the ninth lunar month each year, on Oct 7.

In Chinese tradition, there are many customs on Chongyang Festival including climbing mountains, hiking and enjoying chrysanthemum flowers. So the festival is also often called the mountain-climbing festival.

The festival also celebrates the elderly and offers younger people the opportunity to show respect for their contributions.

This year, hundreds of elderly residents wearing red waistcoats began their climb at 9 am.

The elderly climbers were full of energy during the hike, though most of them were in their sixties or above.

Seniors pose for a group photo. [Photo/WeChat Account: sheshanlvyoutopnews]

With the help of volunteers, they moved methodically toward the top of the mountain and sometimes took photos with each other to save the memorable moments.

Sheshan Mountain consists of an eastern peak and a western peak. They both stretch several miles. It is green in the four seasons and bamboos are all over the slopes. Behind the mountain, there are cliffs formed by quarries.