I work at Twilio, and we put a lot of effort into providing a hiring experience that removes as many biases as possible. The end result is a solid, diverse workforce that understands that we all come from different walks of life and have different employment expectations. Other companies, such as Stripe, also seem to have similar initiatives in their hiring practices.
It's a concern, but some of us are actively fighting it.
Getting my first job was hard and age was definitely an issue, no doubt about it. A guy I graduated with who was a year older than me at the time (mid 30s) was flat out told by one recruiter that he was too old for post-grad Microsoft-university (which is a 1 year paid internship focussing on MS development).