I remembered a math joke this morning that I haven’t thought of in a long time. Two mathematicians, both 30 years old, married to one another, are talking over coffee. The husband says to his wife:
When I’m 60, I’m trading you in for a 20-year-old.
The wife retorts:
Yeah? Well, when I’m 60, I’m also going to get a 20-year-old. And remember, 20 goes into 60 a whole lot more than 60 goes into 20.