Github's numbers are going to be biased towards programmers who use languages that are more progressive. .NET developers aren't using Github and neither are many older companies that are still using self-hosted SVN and CVS repos.
http://smash.ly -- In the about.me/flavors.me space where you create a profile, but in our case we integrate your content in a feed. The idea was spawned by the fact that so many of us have personal domain names that always get outdated, so we built something that uses content you're already creating to make your personal website looking fresh. Here are a couple sample profiles:
Clear's network isn't great, but I really like the pay-as-you go aspect of this. Right now I'm paying $25 a month for an unlocked iSpot but I go weeks without using it.
As someone with experience hiring developers, my concerns about "older developers" were two-fold.
First, the cultural fit. If the company is all mid 20-somethings, would you fit in with the team. ?
Secondly, are you really set in your wise regarding your code and almost as important, what SDLC you're comfortable with (because we aren't using waterfall here!)
So I wouldn't ever not hire someone just for being old, but those are two concerns that I'd have with any candidate and they're a little more of an issue with older developers.
That said, regardless of your age, what is going to get your a job is networking. Start getting involved in the community now. Take on freelancing projects. Attend meetups. Get to know people.
I hear ya. We've only been live for about a month now and we've been focusing primarily on growing the user base and adding features for the users. We haven't yet put a lot of effort into getting employers to post job postings, because if they get no responses then it would hurt the likelihood that they'd return once the user base has grown. That said, the companies that we have gotten have been pretty high quality (mainly startups) and we've been surprised how high some of the salary ranges go.