Tourist,
I too was treated to a tour of their toys and recall pretty much the same as you. Did you get the story about the toothpaste tube pipe through the lip?
Anyway, all the evidence everywhere, and collective recollection points to the majority of these guys being a lot older than early 20s and from all sorts of backgrounds.
500N,
Yes, Gary Powers had his 31st birthday in a Soviet prison about 3 months after being shot down.