So why would elderly security guards end up doing this you might ask?
Simple: there's tons of security guards, retail clerks, etc. on various levels of disability because they can't stand/walk for full shifts. So sitting in a chair doing next to nothing is a great way for management to give them something useful to do while they (hopefully!) recover.
Hence the least healthy people end up with jobs that if we were following science would go you young teens. But this isn't about science...