I found my most recent job through Linkedin. At interview, the panel said that they were proud that theirs was a very young company, and that they had actively recruited young, dynamic people (I AM a bit manic, but not sure I count as dynamic!).
At which point, I politely coughed and asked why, out of all the applicants, they had picked ME (because at this point, they'd offered me the job on the spot).
They said it was the strength of my CV and the breadth of my experience.
Either that, or they were lying about having a LOT of other applicants!

Anyway, my POINT was, Linkedin. You can post a photograph of yourself so they can SEE how old you are. Anyone that contacts you knows you're an older applicant. Worked for me.