I think being light hearted enough to enjoy "play" at any age is an awesome quality.
I spoke of my great grandfather and great grandmother. They were both late nineties when they passed on and had over 80 years of marriage together.
When my family was younger, we went to a park. There was a big spiral slide there. We were sliding down it, especially my younger brother.
Great GrandDad, who is about 90 at the time, walks over to the ladder and announces announcements his wife: "Bert! Hold my cane!" And he proceeds to climb this ladder. It takes an eon and Great Grammy is snapping the whole time:" Frank! Frank!"
He finally situated himself and goes down, hands in the air yelling "Weeeeeeee!"
The stories about him are endless.
One other: When he was 84, he gets someone to drive him 90 miles to a town and he buys the biggest, most powerful 3 wheeled Honda available at the time. Now his daughter, my grandmother, gets word of this and has a fit and makes him take it back.
He promised to...and did...only he traded it in for the SECOND biggest, most powerful three Honda available, this fulfilling his promise to his daughter.
He bought it so he could ride it with the teenagers he was allowing to rife on his farm.
I remember him being so proud when he learned to execute a "donut" move with the best of the kids.