STOP CRAMMING EVERYTHING INTO YOUR RESUME
A common mistake that job seekers make when preparing their resumes is attempting to "cram" in every detail about their experience, skills, data, and interests. By all means, you want your resume to be as professional as it can be as you offer a substantive presentation of what you can bring to the table for an organization.
A substantive presentation - NOT an exhaustive presentation!
Your resume should be a document of your curated experience, skills, and interests, with your selections informed by the most impressive and relevant elements of your background and the requirements of the position you are applying for.
It should not list every mundane job responsibility, every course you took in college, or all of your hobbies and interests. In many instances, it is not even necessary to list every position you have held. If a piece of information on your resume does not make you a stronger, more interesting candidate, either re-frame it or remove it.
Removing extraneous information will free up valuable real estate on your resume, allowing you to list and elaborate on things that do strengthen you as a candidate (not to mention, you would also be shortening your document, making it more readable and less likely to be tossed aside because it is too long.) Go into a bit of detail about the implementaion project you led and what the results were. Note the relevant professional associations you are a member of and your certifications. Using resume real estate in that manner is invariably better than focusing on your junior position from 20 years ago or stating that you made copies and did routine data entry.
You have much to offer. The key is in communicating clearly what you would bring to an organization, with a substantive presentation - not an exhaustive one.