So the older crowd are stubborn, set in their ways, and lazy -- and probably challenge the young people that you admit know nothing and have no experience for good reason.
And the young people are inexperienced and ignorant, but (when not hanging out on facebook, twitter, or instagramming everything around them in the office) hard workers that can be shaped, molded, and educated. . . . by . . . the . . . older people that aren't there to mentor them?
The world of technology does not seem one where this ageist bullshit can adequately be implemented. This is a field where people from the youngest who aren't even in high school yet to the oldest who was working before a time of personal PCs invent and improve things on a frequent basis and are *in the business* of wanting to know about new things. This isn't a field where people bitch and moan about how these new-fangled sparky-mabobs aren't as good as working on an old IBM Selectronic typewriter.
I work with plenty of people in their 40s, 50s, and 60s and they are the hardest workers who know the most, spend the most time on the clock, are the most available, the most communicative, and stay on top of their game. In my time, I can only really thing of one much older person who really sort of had the "punching the timeclock" mentality -- and even he was more than proficient at the job.
On the other hand, I have been surrounded by people my age (increasing over the years, obviously) who couldn't really be bothered half the time. If you are concerned with age and pay, you are focusing on the wrong values of your potential workforce.