Also, I’m unclear about how to briefly fit my 45 years experience into a resume format
You don't. I have a way less experience and I still only show my last 10 years. As I said somewhere, if someone is interested in my experience in managing a (now) 15 years old specific software then I is not interested in them.
Also I'm in favour of 'CV should fit on a single page'. If someone looks for talent then this is more than enough to interest them and nobody looks at the second page anyway.
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You don't. I have a way less experience and I still only show my last 10 years. As I said somewhere, if someone is interested in my experience in managing a (now) 15 years old specific software then I is not interested in them.
Also I'm in favour of 'CV should fit on a single page'. If someone looks for talent then this is more than enough to interest them and nobody looks at the second page anyway.