Speaking from experience you need two resumes (I’m much younger, but with a long career). One that’s management focused and one that’s developer focused. Use the appropriate resume for the role you are applying for. Even though I’m a hands on engineer people didn’t want to consider me for roles because I had management experience and they thought the engineering role would be too boring, and vice versa. Reduce your resume to your experience from the last 10 years. They don’t need to see your first job. Don’t put dates next to your degrees. Don’t say “35 years of experience.” You have to accept that there is age discrimination but there is also manager discrimination and developer discrimination and all sorts of biases, you need to use that to your advantage by crafting resumes with different narratives, highlighting different strengths, dependent on the role.