Do people often use the word "fire" (noun) to refer to enthusiasm? This is a topic at my English Speaking Club: "Fire in young people, is it strong enough in this modern world?" (the topic is about young people's enthusiasm). However, when I look for information about this topic on the Internet to prepare for discussing, I find that people don't use "fire in young people" very often to refer to enthusiasm. As English native speakers, could you explain this to me? I would also really appreciate it if you could suggest me any other more suitable phrases with the same meaning?