I'm 49 and find that ageism is alive and well. I've been a *nix admin since the late 90s, and my last couple of interviews it was obvious they were shocked I wasn't in management. I will never be in management. To be honest, I don't like working with people. I prefer and have always preferred being in the data center basement or in the data center proper.
My age, coupled with with the fact that I prefer machines over people doesn't endear me to this newer generation of techs. I have been asked at my last several jobs why I don't use Facebook, LinkedIn, or any other social media.
I'm a greybeard and I like it that way. I'll gladly ride out the terminal windows job and light programming until they show me the door. Meetings and budgets are for others...