Once nanna hit 75, the grandchild survival benefit disappeared-and then some.

一旦祖母到了75岁，孙辈的生存益处就会消失——而且还远不止如此。

" grandma" , " granny" , " gran" , " nan" , " nanna" , or " nannah" .

所以：“奶奶”、“奶奶”、“奶奶”、“南”、“南娜”或“南娜”。

So, grandmother: " grandma" ;" granny" ;" gran" ;" nan" ;" nanna" , or I've heard some people pronounce it: " nannah" , but I think that's a particular region that does that.

“南” ； “南娜” ，或者我听过一些人这样念：“南娜”，但我认为那是特定地区的发音。