When you say "older" how much older do you mean? 30s, 40s, 50s, 60s, 70s+?
I have not had any problem yet regarding my age (40s), and just landed a decent initial offer from a Silicon Valley company.
You don't need to be a 20-something to land a good job. You just need to be somewhat good at what you do.
In my last 3~5 gigs my age has never been brought up. Not even once IIRC.