I'd love to work on a team like that to be honest, all of the places I've worked at we haven't so much as even gone to the movies because of the age differences. One married w/kids, other 20-something, other Vim warrior from the 70's, etc.
With people of different ages it's far harder to work around that, and easier to notice when the chemistry is great. It's fantastic when it works out like that, but difficult or boring if it does not.
But I don't understood the trend of working with people for 10 hours, and then hitting the bar/bowling alley/movie theater/beer fridge to hang out more. As an occasional event, it's great. But as a regular event, it feels like the company is just insinuating itself further into your non-work life, breaking down the boundary until you have no non-work life. No thanks.