How did people define "youth" in 2021? A wrinkle-free face? Under the age of 20? When we talk about youth, what exactly do we mean? To find out some answers, "C the Difference" took to the streets and talked to people of different age groups. From young fans at the biggest book market in Beijing to senior models over the age of 50, we not only discussed the topic of youth but also gave them the opportunity to ask questions directly to each other.