Do you know any old people's jokes?

Thought this one was hilarious.

There was this guy who really takes care of his body; he lifts weights and jogs six miles every day. One morning he looked into the mirror and admired his body and noticed that he was tanned all over with the exception of his penis, which he readily decided to do something about.
He went to the beach, undressed, and buried himself in the sand except for his penis, which he left sticking out.
Two old ladies were strolling along the beach, one using a cane. Upon seeing the thing sticking out of the sand she began to move it around with her cane. Remarking to the other old lady saying, “There is really no Justice in the world” The other old lady said, “What do you mean by that?” The first old lady said, “Look at that…....
When I was 20, I was curious about it
When I was 30, I enjoyed it
When I was 40, I asked for it
When I was 50, I paid for it
When I was 60, I prayed for it
When I was 70, I forgot it
And now that I’m 80, the damn things are growing WILD and I’m too old to squat!!”

What would be your best old people’s joke?