Older people probably have an expectation that you have read and understood the rules as well
Old people are frail. The world appears frail to them. And as you age, the flaws of the world become more apparent, and the world appears even more like it is hanging on an edge.
Of course most people also have rosy glasses about their good old days, where people followed the law and things just worked.
So old people think adhering to rules and avoiding chaos is what kept everything from falling apart.
Also, as you get older, your routine becomes everything, as your neuroplasticity decreases and ability to deal with change. Rules keep things the same.
EDIT:
Also, one of my favorite explanations of popular vs nerd people in high school: popular kids spend all their free time being popular. Nerds work on school and other things.
In that vein, old people don't really have anything to do other than be nosy. They sleep less, are retired, and living off social security means "hanging around where you're at and not doing much".
They are perversely like teenagers.
I am not sure if this is better or worse than my idiot downstairs neighbors that would party every weekend til 3am with zero regard for any of their neighbors. Then they are banging on the ceiling at 4pm on a Wednesday because we were moving furniture around for 15 minutes.
It's harder the fifty-five thousandth time, and that seeps into everything you do.
Also the old people who give absolutely zero shits; those you don't hear from.
It's easy to imagine elderly people clinging desperately to what little resistance to change they have power over. It's motivated by a mix of fear and spite for a world they no longer understand. They may not be able to prevent other races from moving in next door, but remove that mat from the handrail, and stay off the lawn!
It should also be noted that you don't notice the nice old people who leave you alone because they're not in your face complaining. (A type of availability bias?)
I can only imagine how I'll be in another 40 years.
Everyday the country is developing new useless laws to control people. Soon there will be only one set way to live and thats it because all laws and rules will be written.