[wyldfire]

Well, even if there weren't a problem with age bias I would expect the median to be skewed lower. The details indicate that not all respondents are professionals. This could include youths, still in secondary school who are learning to program.

But if the age distribution of people is such that the median age of humans were 27, it shouldn't concern us that the median age of this population of survey respondents is 27. I don't know what the human population distribution is but I took a quick peek at the US census bureau and it seems to indicate much more young people than older. I suppose that shouldn't really be surprising.