While a "35 year career in Silicon Valley" might sound impressive to some people (and perhaps rightly so), as a hiring manager I probably don't care about any projects/technologies you worked on in 1983... I want to know whether you can do the project I need delivered now. Tell me what you worked on last year and in the last 5 years - skim over or leave out the rest.
(If you're dealing through recruiters instead of directly with hiring managers, you've got a different set of problems - the solution to which is probably ignore the recruiters and don't play that game - surely a 35 year career has left you with a network that can bypass those rent-seeking gatekeepers?)
I’ve noticed some anxious double-takes in interviews after passing hiring filters with my shorter resume.
I’ve met people who have changed careers and decided to leave off their prior career work. Resumes are used in the background check for some companies but no one looks beyond 7 years. And if they really have a problem, do you really want to work for them?