Whenever I read an article drawing conclusions about the world based on interviews with those attending a school reunion, I consider the inherent selection bias

Whenever I read an article drawing conclusions about the world based on interviews with those attending a school reunion, I consider the inherent selection bias. If I'm an unemployed 60-something, I might consider a class reunion to be a great networking opportunity. And, of course, my time has a low opportunity cost. Conversely, am I willing to fly across the country for the weekend if I'm working a lot and need to be in the office on Monday morning? Also, those whose lives at age 60 aren't all that fulfilling professionally or otherwise might be more likely to attend a reunion where the could be reminded of better times. [I say this as someone excited to attend my 20 year high school reunion this summer.] A survey of Stanford engineering graduates done by random selection would be much more interesting.