Old = over 40s (myself included) who are senior, their careers have been in offices and commuting, and still believe that 'managing people' means real-life first person interaction, and are completely invested in offices, and the cost of paying for them, rather than downsizing.
Young = under 40s - have grown up with the internet, github, working/studying remotely and so on.
I've worked in companies where the CEO and senior management are all 50 something, and in a couple of companies where they're all approaching 40. Can you guess which company used PCs and which one used Macbooks?
Going back further, I can remember working on Sun boxes, because management was reluctant to use that 'new fangled NT3.51 or even NT4.0'.
The point being, as the workforce demographic changes, so will the opinions and approaches. And the cycle will repeat.