-They have some sort of windfall
-They have a trust fund or stipend that they receive just for existing
-Their parents pay for everything, or, alternatively, their parents pay for all of their living expenses so their own money is only "fun money."
-They, somehow, have a high paying job. In which case they probably won't be going to school full time also. Or they're "job" is having a lot of followers on social media.
This isn't a knock on anyone, I'm just trying to explain why one young adult student can be excited because they were finally able to save up for a soldering iron and another has a garage full of expensive experiment to tinker with.
It's pretty much implied this guy's living expenses (or most of them) are covered by his parents who also have tons of extra space and tolerance for him using it.