There's one huge hole in the analysis: the dataset. The older someone is, the less chance they'll spend time on an internet community site, especially at work,

There's one huge hole in the analysis: the dataset. The older someone is, the less chance they'll spend time on an internet community site, especially at work, which is when a lot of people access stackoverflow. Old dudes work while they're at work, because they learned their work ethic in pre-internet times.