Depends on the job. My first job out of university was mostly older people (mid 30s+) and there was no socializing. It sucked for me, in a new city with few friends, I would have been happy to go out for beers or whatever. A later job, many of us were single, new in the city, and had lots of after work social time. Now personally I'd still be happy to go for beers after work but I have a family so it's not really possible and I've become the lame older person. Anyway, all that to say, it's good to work with some people at a similar life stage so then you can be social or not without worry.