> A friend and I were talking about our families today when I realized that my grandmother (this grandmother) became a grandma (not my grandma) at 45.
I got confused and distracted trying to solve the riddle of why his "grandmother" was not his "grandma" [0] when it had nothing to do with the point he was trying to make. And the "this grandmother" parenthetical could have just been a subtle inline link.
> A friend and I were talking about our families today when I realized that _my_grandmother_ became a grandma at 45.
Much clearer!
0: I think he meant that his grandmother's first grandchild, who born when she was 45, was someone other than the author, so technically she wasn't /his/ grandma at that moment because he didn't actually exist yet.