Over ten - twenty years in a resume? Manager / Sr Manager level

I have read over time to keep it at ten years, and maybe add a summary or mentioning it in the resume summary. Maybe moving some of that experience into my other roles? I am only talking about the Director level roles / resume.
https://www.indeed.com/career-advice/resumes-cover-letters/how-far-back-to-go-on-resume
Should I include / delete my oldest employer, for a Director level resume? It goes back so many years ago but it was over a decade of employment just with that employer. I've been in the industry - Corporate accounting about 22 years (yeah, showing my age).

I am thinking to include it when the role might as for 15+ years experience. The senior role I am looking at now only asks for 10+ years.

• "10+ years of management / directorship experience in Counting doughnuts(jk on the doughnuts) and Accounts Receivable."

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