Hello Lady Helen. Congratulations on the 84 upstanding years. Go, girl, go!
As to the realization that some people do not accept as Truth, what you accept AS Truth, should not be much of a surprise to someone of your experience. Unless you live in a very insular, protected environment where all your friends and family believe pretty much the same way I do not see how you could not have noticed that there are not some, but MANY, who do not share your opinions. It's not rocket science.
Personally, I wouldn't sweat it, sweetie. You have, no doubt, led a good life, and it would be a shame to spoil it now by becoming anxious about what others think. Just let them go blithely along their way and feel secure in what you know of as the truth -- unless of course you are slightly masochistic.
Take care, it is time for this old fool to head out to the gardens for another round of grubbing in the dirt. (Life sucks, don't it?)