Ever been within earshot of elderly people when they are in mid-rant?
I don’t know what happens to older people when they reach a certain point in their lives. Perhaps old age loosens inhibitions, kind of like drugs or alcohol but without the knowledge that tomorrow, everything will be back to normal and you’ll be in your twenties again. Maybe they are just so damned tired of it all.
Don’t ignore what they are saying. Tune in. Catch a few gems from what is left of the minds of people who have been around so long, they remember when there was only one World War. 
I remember an aunt who took me aside one day and said, perfectly seriously, “Never marry a French girl! You’ll spend the rest of your life eating out of a can!” To this day, I’ve never been in a relationship with a French girl. I’m not sure that ready-to-eat tinned food had anything to do with it. I don’t think so, anyway.
I also had a grandmother who held some pretty crisp views on Orientals. I use the world ‘Orientals’ because said grandmother did not distinguish between the Chinese, Japanese, Koreans, Vietnamese, Thais, etc. In fact, she may very well have been surprised (and more than a little disturbed) to hear that there were more than one kind of Oriental. To her, they were all “i cinese”… pronounced “ee chee-NEH-seh”… i.e. the Chinese.
To be honest, I sincerely doubt that my grandmother ever met an Oriental person, Chinese or otherwise, so I am not altogether sure how she came by her strongly-held beliefs. But she was not loathe to expound on the subject, believe you me.
So, next time an old person goes off on a tear on one topic or another… e.g. an uncle of mine complains about the government full-time… give a listen. You’ll probably not learn anything new but see if it doesn’t make you think about what you yourself will be harping on about when you are in your dotage.
 BTW: In case you never thought about it, it was only called World War One when people figured out we better start numbering them. Before then, WW1 was called The Great War or simply, the War. NB: To people in The South, “The War” refers to the American Civil War (i.e. the War of Northern Aggression).