How old are Zhao Benshan’s twins?

Uncle Benshan gradually faded away from the stage, but Uncle Benshan’s twin twins gradually surfaced. If the appearance of Zhao Benshan's children before was just an ordinary father and son showing off together, now the two children will inherit their father's business and take over as the heads of a business empire with assets of 3 billion yuan. His daughter Niuniu was born on the first day of the first lunar month in 1997. She also has a sibling brother named Niu Niu. Zhao Benshan named the children Zhao Yinan and Zhao Yihan, and their nicknames were Niu Niu and Niu Niu. Some time ago, there were rumors that Niu Niu wanted to join a Japanese girl group and enter the Japanese entertainment industry. Now Changchun International Trade Center refuted the rumors on behalf of Zhao Benshan. It is reported that Niuniu is studying at an international college in Singapore. Son Zhao Yinan is very low-key, rarely exposed to the public, and has always focused on his studies.