My grandparents are both 93. They've been married since they got out of college, they live independently, and they're perfect foils for each other. They're healthier than I am. My grandmother walks a mile each day and rides a stationary bike at night. This is because she has recently discovered diabetes and is alert to the dangers of end-organ damage.
I (plan to) call my grandmother weekly. I've been better about it since I commute and have all that driving time. Some conversations are worth preserving.
Yesterday I called her and she said, "Grandpa is on his phone talking to Uncle X. Let me switch rooms."
Grandpa comes on the line. "Hello?"
"Well, I'm on the phone!"
[Perplexed] "Um...well...yeah...grandma went to get on the extension in the other room."
"What? I'm on the phone!"
[Grandma's voice, distantly] "You're on the other phone! With X! I've answered that one to talk to NNR but I want to talk in here so I can hear!"
[Grandpa, loudly, because he has forgotten he is yelling into my ear] "But DEAR, I'm on the phone!" [To me] "Who is this?"
[Grandma picks up extension] "Are you there?"
[To Grandpa] "Hang up! Pick up your other phone!"