The processors in there are still probably fast enough, they will just be hotter and consume more battery power (and the battery capacity is diminished). If they have more RAM and maybe an SSD + run Linux they'll be fine. A modern OS (windows 10 or Linux is a must). I have a laptop from 2011 and it runs fine.
Maybe devise a test which you can do with your boss? Write down 10 common tasks and try them out on one of the computers.
Maybe devise a test which you can do with your boss? Write down 10 common tasks and try them out on one of the computers.