Tech innovation is accelerating.

The old guys vastly underestimate the productivity difference between old tech and hip new tech.

The young guys vastly overestimate how much of their productivity is due to their own smarts rather than using hip tech, and don't sufficiently appreciate that when they get older, the experience they've accumulated won't be worth much, either. Re-learning everything every 5 years is only fun the first and second times.

But certainly, years of experience with some tech is becoming less and less valuable, as the tech is changing faster and faster.