They *THINK* they can get someone younger for much less pay.
And they *THINK* they will get all the experience from that younger person too.
What sets us "old farts" apart from the younger folks is that when we started, computers, software and infrastructure weren't half as complex as they are today. And we have seen it all grow. With that, we still know what happens under the hood. We still recognize a failing harddisk, a bad memory problem, a network routing issue etc, when the young guys just see their mouse, tablet or app not doing what they expect. The young folks know where to look when things work. We know where to look when things fail. Employers do not recognize that until they are hit by disaster.