My sixty three year old FIL just spent a week at my house. He woke up at 5 every morning. Stomped down every stair from the second floor the basement, turned on the basement TV loud enough that he could hear it back on the first floor as he banged every pan in the kitchen looking for the coffee beans we left out for him (and showed him) the night before.

As soon as anyone one else was awake he went back up to his room for a nap. He came back down when brunch was served, then went back downstairs to watch more TV. Sometimes getting the kids to end their show. He only came back up for dinner and didn't talk to anyone that came down to say hi.

After dinner we invited him to join us for a game. And he denied because..."I've spent all day with you people and I need some time to myself."

He's 63. My MIL is 64 and she drank, cooked, cleaned, and partied with the rest of us.

Long story short, some people are very old in their 60s and some aren't.