Twice

Okay, TWICE is the second most famous K-pop group in the world. There are 9 members: Nayeon is 30 years old; Jeongyeon, Momo, Sana, Jihyo, and Mina are 29; Dahyun is 28; and Chaeyoung and Tzuyu are 27. They are very kind and sweet to everyone, as well as very famous and beautiful.