I see all these articles about the average employee age at startups being 20-30, and how older developers face discrimination. Now this is 100% anecdotal, but I know a few 45+ year old developers and most of them are long-time corporate employees and are not really interested in the whole startup / bloggosphere / tech hype world. They have good stable jobs (think Perl, .NET, Java), and are mainly focused on their fam…
I turned 40 this year, I haven't noticed any differences. I've been contracting since 2010 and I never meet most of my clients, I guess they could guess my age from the length of my experience. I specialize in Pro Audio / DSP which seems to be an older field, maybe because it's slower changing and experience is more important.
I think racial / gender discrimination is a bigger issue than age.