Storyline: Retirees choose offseason travel in China [Voice_over] With the weather getting colder in northern China, many retirees are migrating south to spend the winter in a warmer climate. At the Shenzhen Bao'an International Airport, seniors dragging heavy luggage have become an increasingly regular site these days. [Sound_bite] Tourist: "I'm from Harbin, and I'm taking a trip to Shenzhen, Hong Kong, Macao and Zhuhai and then I'll spend the whole winter in Sanya." [Voice_over] Data from an airline passenger service platform shows that now during the off season, the average price of domestic flights has been around 106 U.S. dollars. For senior travelers, cheap and comfortable are their top requirements. [Sound_bite] Meng Xiaoshu, Crew chief, China Southern Airlines: "From late of last month, attendance rate on the flights which from Beijing, Harbin, Changchun and Shenyang to Shenzhen is up to 85 percent, about four percent more than last year. The number of the elderly on a flight is over 50." [Voice_over] Data shows that by the end of last year, there were more than 300 million people aged 60 and above in China, accounting for 22 percent of the total population. [Restrictions: No access Chinese mainland]