How about a classic joke? Classic, not too fancy.

A few days ago, a friend went to the park to play and felt very thirsty. He went to the roadside shop to drink soda. I saw a six-or seven-year-old girl in the shop, and she was very cute, so I chatted with her.

Me: How old are you, little friend?

Little girl: Seven years old.

Me: What grade are you in?

Little girl: Grade one.

Me: Do you read well, little friend?

Little girl: Don't call me little friend, I don't like it.

Me: I am older than you. Of course I call you little friend.

Little girl: Now you are older than me, but in ten years, I will be older than you.

Me: Ten years later, I will be ten years older!

Little girl: (unconvinced) Then another hundred years.

Me: Why?

Little girl: At that time, you must be gone. I'm still here. Of course, I'm old.

Ha ha ha, everyone present laughed.