As a guy who can talk shop with mainframers, and taught Linux Security to to a classroom of them at a big blue building where such machines are manufactured, I

As a guy who can talk shop with mainframers, and taught Linux Security to to a classroom of them at a big blue building where such machines are manufactured, I concur. There was the technical divide ("Buffer overflows? Meh, we just kill them and start a new instance!") to the generational divide - I was near-30 and this was near-2000. I think I was the only person there who didn't (yet?) belong to a charitable secret society. This stuff is only very quickly hinted at in my CV. Trying to explain it in interviews is painful at best. It's a past job experience I've just kept mainly to myself when it comes to resumes. The age thing happens in both directions, and seems damn near unavoidable.