I agree with all your sentiments. I think the key thing is that younger people tend to equate efficiency with lines of code written. As you get older, you reali

I agree with all your sentiments. I think the key thing is that younger people tend to equate efficiency with lines of code written. As you get older, you realize that pausing long enough to consider all implications leads to better solutions. Fast and hacky is fine for prototypes but (hopefully) eventually it needs to scale and be stable and supportable. I also think that the Zuckerberg quote also points to the startup mentality. They want 22 year olds because you can get them to work 100 hour weeks against the promise of an IPO, not because they are "smarter". Hard to convince a 40 year old with two kids to do the same. There has already been a shift to more traditional CS companies (IBM, etc.) as the lack of IPOs has soured some people on the startup dream of being employee #3 at the next Uber of XXX.