It's an older boss or coworker who has issues with you being on your phone, but you still get the same amount of work done.
It's an older boss or coworker who complains about you leaving at 5pm because they have to stay up so late just to get the same amount of work done.
It's an older boss or coworker who watches your screen to make sure you're always working.
It's an older boss or coworker who is bothered when you're resting for a minute because you finished your work early. So, they find new tasks to give you.