Why do so many video game streamers on Twitch look so young?

They claim to be 25+ years old, but I swear some of them look like they are 17. Is it because they are malnourished from playing video games nonstop? Most look deathly skinny
Update: They even act young as well. Everything about them screams that they never matured past high school, yet some are 30 years old
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