[hackerbobtas]

"The look on the faces of a fresh crop of 20-something developers"... My equivalent is doing a data reformat or analysis on a big dataset that someone has been struggling with in (please excuse my language) Excel. The data owner's eyes widen and they say something like "Wow! That's so fast and simple! How come I never heard of this stuff?"

Good question about "Old". In Australia there's at least one well-defined cut-off: 75 years. If you're 75 or older: - when you die your death isn't classed as "premature", and demographers don't assign you any "potential years of life lost" - you're no longer invited to have screening for bowel, breast or cervical cancer screening (invites go to 50-74 year-olds)