It makes sense for grandparents to be diff. since especially after the war were pple married cousins, pple from their hometown, shidduchim were really limited.
My grandparents (whom I mentioned above) were both born in New York City and did not meet via shidduchim. In other words, it’s not always about lack of opportunity.
Nonetheless, despite their very different personalities, my grandparents were married for over fifty years.
The Wolf