How can I be more comfortable around senior citizens?

[Good Knight]

Now, I don't mean this bad and it isn't a major problem but I have always found it a little hard to relate to senior citizens. Well, even my parents sometimes because they don't understand what I do for a living and my hobbies. I grew up in a city away from my grandparents and even though I love them very much, conversations always felt a little awkward with them. Maybe even from their side too. I'm no pro at small talk so it is acceptable if you want to blame it on that. Maybe I haven't found the right topics. I had always wanted to ask my Grandfather about WWII but wasn't sure if he wanted to talk about it. My Great Grandmother had an excellent memory and would talk to us but I always felt silly (then of course) asking stupid questions like, "what did you do before TV?"

I have a similar question about teenagers too but I'll save that for another day and another category.

Apologies if I'm the 3rd one to ask this in the hour.