I've worked with lots of older chemists; I've found all ranges of behavior, great and not so great. The thing that concerns me the most is an adherence to failing memories for all manner of managerial tasks and details -- it seems that consulting notepads/e-mails/references is just too much trouble. I don't think people realize how much credibility they can lose when they do not rely on notes in a public setting and get all manner of fairly key details incorrect. Of course, I don't think this is something that's unique to older people -- I suspect it is simply that they are more likely to be in a situation where they're the ones talking, and everyone else is listening (and perhaps critiquing) intently.
[I also suspect that I've been exposed to one particular type of older chemist and precious few others.]
So, Chemjobber readers under 40, what gentle advice do you have for your older colleagues?