Today marks the traditional "Double Nine Festival" in China. The 9th Day of the 9th month on the lunar calendar is meant to celebrate the life and longevity of the elderly. It is a time to celebrate health and longevity. Haidian Senior University is the first university for the elderly in Beijing. Here's a group of people who never bow to their age and who make full use of their retirement time. It's never too old to learn.