It is interesting when you say "Since I have moved up into the mountains and gotten older I no longer suffer altitude headache."

And note what Skippy wrote above:
"This is an interesting discussion for me as I live in Colorado and have never had any real problems at altitude... I live at 4,500 ft..."

I am getting the notion that people living at higher elevations, even 4-5k, can more easily climb Fourteeners without experiencing bad AMS symptoms than people living near sea level.

From my personal experience, years ago I'd often go to a mountain cabin at ~5K on weekends, and would always find myself needing more sleep at first.
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