If Mob met Reigen four years ago when he was ten, and Reigen’s 27 at the start of the show, that means Reigen started S&S when he was 23.
If he took the usual education path that means he started college at 18 and left four years later at 22.
Which means:
Either Reigen has no college degree and has been winging it this whole time.
Or he had a professional office job for ONE WHOLE YEAR before going ‘fuck this’ and started a career as a pretend ghostbuster.
Quitting his job is framed as this big life changing move brought on by depression but we might need to consider that Reigen’s just always been this weird
No wonder his mom’s so mad at him