Change - the only constant there is outside of death and taxes. Know it is there and roll with the punches or they will knock you out.
The first two real jobs I ever had 35 years ago - Mailroom clerk at a Fortune 25 HQ and being promoted to a File Clerk do not exist anymore. I also went to College night school on a tuition reimbursement program that also no longer exists.
But like the coaches the world is getting away from me as I age. You should see the looks I get when tell people I don't have a cell phone and do not want one. I cannot understand why anyone wants one. The idea of the whole planet being able to talk at me on demand horrifies me. More proof I am a grumpy old man I suppose.