Then again, I won't be an "SDE II" or whatever I am now in 5 years, I'll have started a business, gone into consulting, or gone back to school for a Ph.D (pick 2?). So I don't know.
I have yet to hear anyone I've worked with say something ageist or fearful about age at work. Everyone is very cheerful about their careers.
And to be clear, I'm very, very blunt with management and co-workers about work-life balance. I work 35-40 hours a week when things are slow and step it up when things get hot two or three times a year. I think it's irresponsible to work more hours (it stunts growth, limits productivity, and makes me unhappy).
I don't think that ageism isn't a problem, I guess I just haven't seen it. Then again I've always been sort of disgusted by gaggles of squirming kids, so I've probably self-selected where I've tried to find work. Why in the hell would anyone want to move to SV in their 40's+? That's like going to a college party to make friends or find a romantic partner in your 40's... the prospects are much greener and more attractive elsewhere.
This whole conversation strikes me as very odd.