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I wonder if the nearness of the MMR vaccinations for school children has something to do with why they are not as affected by the viur?... Like the immune response is still at a high enough level to ward off the virus, but with old dudes like me at 75 it is beyond weal response?

At the CDC site, there is this information about MMR. There is nothing about age restrictions.

Adults who should not have the MMR vaccine include people in these groups:
Pregnancy. Pregnant women should not get the MMR vaccine due to risks to the baby. Women who get the MMR vaccine should wait 4 weeks before getting pregnant.
Medical conditions. Adults should talk with their doctor if they:
• Have HIV
• Have any other immune system disorder
• Have cancer or are being given cancer drugs or X-rays
• Are taking steroids or other drugs that affect the immune system
• Have had a low platelet count (a blood disorder)
• Have had a blood transfusion or took blood products
• Have a moderate or severe illness
As with many vaccines, the MMR vaccine works with the immune system to build up protection by putting a small amount of the virus into the body. The safest and most effective ingredients in the MMR vaccine used today include "attenuated" forms of each virus, which means they're live forms of the virus that have been made weak in medical labs.
For most adults, the benefits of the MMR vaccine outweigh the risks. A few people develop a short-term mild rash, fever, swollen glands, or pain and stiffness in the joints after getting the shot. More serious, and rare, side effects include a temporary low platelet count or serious allergic reaction.
Call your doctor if you have trouble breathing, dizziness, rapid heartbeat, hives, weakness, or other problems after vaccination.

You would think that actually having Measles, Mumps and Rubella would afford even better protection. I am 78 and had all of the childhood diseases. In fact, I had mumps and chicken pox at the same time!