It is only natural that this FIRE-movement is popular among people who are in their 30s or 40s. By the age of 30 or 35, most people have "figured it out" what they actually want to do with their life. They also have savings and assets if they haven't spent it all in their 20s.
I started to learn about investing while I was 18 years old and been in the game ever since. I'm 24 now. Is there anyone who is in their 20s or early 30s ? I feel like I'm a bit stranger in the FIRE-game because I'm so young compared to the rest of you. But, I cannot be the only one. So, STAND UP and REVEAL YOURSELVES ! 8)