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>I think that age is correlation, not causation.

Agreed. I started working in tech when I was 22--now I'm over 30. I've never witnessed old-age discrimination. What I have witnessed are start-ups, built on newer tech, (AWS over on-prem, nosql over relational, etc), passing on candidates whose last reference book was the Data Warehouse Toolkit and still want to be called WebMasters.

The law of the tech industry is when you stop learning--at any age, you lose market value.

There is a difference (both in terms of perceived and actual value) between "never stop learning" and constantly being on the language/framework-of-the-year treadmill.

It's funny, I've been in the industry so long and I usually stay at places 5+ years, so I've been able to skip quite a few trends. When new guys come in, I'll ask about the stuff I've skipped wondering if they are still relevant. Sometimes they are and sometimes I hear things like, "oh, that's so old, this is the new thing."

Yup, I lucked out by hitching my horse to C++ and Linux early in my career. The need for either of them never seems to go away. Also bet on a few technologies that kind of petered out, like OpenGL, and there were a few I'm glad I didn't waste time on.

You can always catch-up and learn something that becomes important/mainstream, but you can't un-waste your time deep diving on a dead-end technology.

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