Boy, are Americans getting old.

According to the U.S. Census Bureau, the median age – the age at which half of the population is older and half is younger – hit an all-time high of 38.0 in 2017.

Why is it rising? Because our massive baby-boom generation continues to go geezer, while young moms and dads are having way fewer kids than American parents used to.

What’s more interesting is that the number of Americans who were 100 years or older also hit a record in 2017 – a numb...