When you come from a family like mine it is natural to think of grandparents as being older. Both my folks were born when their parents were older and then they had me when they were older. So, my grandparents were in their 70's when I was born!
Yikes!
The one that I am the surest of the range of is my grandmother and my mother because the similarity in age when each of us was born was talked about. I would have to do more figuring to get more exact for the others. My grandmother was 38 (I would have to check records for if she was exactly 38 or very close to it one way or the other) when she had my mother and my mother was exactly two months shy of 38 when she had me. But the difference was my mother was the 6th one of 7 and I was an only child.
The oldest of my mothers sisters and brothers was 10 years older than mom. Thus i knew of things that happened here in town quite a ways back. My oldest aunt from that side of the family was born in 1894. I was at times asked how old I am because of that.
It also resulted in some of my classmates having grandparents that my mother had known when she was in school. My dad came from an even smaller town close by so didn't have that connection.