person A: I was sitting on a plane next to an older man_comma_ who was telling me about how he had just visited his father_comma_ but that it was sad because he has dementia and didn't remember him anymore. I was trying to comfort him_comma_ mostly because I worry it will happen to my dad_comma_ too.
person B: It's nice that you tried to comfort him.  I'm worried about my parents_comma_ also.  It's hard to be worried about something like that in your family_comma_ knowing that you have no control over whether or not it will happen.  It's sad.
person A: Yeah. We grow up thinking they're invincible. And then as we get older_comma_ we see that picture deteriorate little by little. And then when they get old and need help_comma_ a lot of the time we don't have time or money to help them_comma_ so it's just stressful and sad all the way around.
person B: Agreed - it's very stressful.  I live half a country away from my parents_comma_ and I'm worried I won't be able to help when either of them need it.  