Why would it not? Presumably the age bias is largely the (obviously incorrect) assumption that a person in their 40s/50s/60s simply doesn't know enough or is unable to learn the new things they need to in order to operate in a startup.

I think the 55 year old interviewing for a dev job with the 28 year old CTO will have a much easier time 25-30 years from now than today. At that point I think you're fighting against culture-wide age bias rather than industry-specific age bias.