I spent a summer regularly exercising with a group of friends who were all in the 50-80 age range (and they kicked my butt). One day there was a conversation like this:
"You know who I saw the other day? Nancy!"
"How's she doing?"
"Well, she's OLD"
"Yeah, that happens"
"How does that happen anyway? One day they're your friend, the next they're old and only complain about their health"
"It's because they stop hanging out with young people".