The average age a man lives in America today is 72. That puts 36 in the exact middle. Middle age if you will.
I tend to agree with your comment because statistically and mathematically it makes sense.
But I knew it was wrong as when Googled it is actually considered to be between 45-65. This 45-65 does not make sense, and I have no way of knowing how this play on words came about.
My biggest gripe in the word-play department is referring to the very central states (ND down to TX) as the midwest. Geographically speaking, this is the exact center of the nation as the actual geographic center of North America is near Rugby, ND.
When I tell people I live in the most north central state in the lower 48 they have no idea what state that is.