First things first, you should be clear about coming out of retirement. Honesty really is the best policy. Who wants to go through the hiring process after coming back to work, only to have to go through it again because the employer found a lie or deception on their resume? It is a different workplace today than it was decades ago, and while playing fast with the truth on a resume has never been looked highly upon, it was more likely someone could get away with it back when there weren’t huge HR departments, easily available background checks, or it was too much of a hassle to find information in general. Today, information is available at light speed thanks to the Internet and even middle management positions are typically only filled after thorough vetting and background checks.
Emphasize in detail your skills as they relate to the specific position you are applying for. Generalists have largely gone by the wayside in the modern workplace as specialization has increased dramatically. Look at the field of medicine for example, where multiple specialties have existed for a while but have been specialized even further into sub-specialties. Drop any experience off your resume that is not related to the position, especially if the experience was gained a long time ago. If the position requires special training and you already have it, feel free to list it, but save space on your resume for more important things than unrelated training or training that happened a long time ago.