52 minus 23 =
It also says that "The U.S. Census does not break down the number of people by specific ages like its national figures," which is not quite true. The census itself has no local intercensal estimates is correct, but it certainly had single year of age data from 2010 and that tells a pretty different story for Pittsburgh. The Census Bureau's national age breakdown for 2014 is itself just an estimate, and their are comparable local estimates out there.
In 2010, the single biggest age group in the Pittsburgh MSA was certainly not made up of those 23 years old and it wasn't even close. The biggest age cohort in the Pittsburgh MSA in 2010? 52 years old. In fact the 5 largest age cohorts in Pittsburgh (the MSA) were ALL in their 50s. The number of 23 year olds is not even close to the number of any of the age cohorts in their 50s. So a fun story nationally, but not really a local story no matter how you look at the data, almost the opposite. And no, the last couple years has not seen a complete inversion of those numbers for Pittsburgh MSA. Here is what I see for the 5 largest single year age cohorts here....
Source: 2010 Decennial Census SF1, Table QT-P2, Single Years of Age and Sex: 2010
Data is sacred they say, but actual digits are pesky. Turns out that among age cohorts before mortality impacts the numbers, say the ages18-60, the number of 23 year olds in Pittsburgh (MSA) is actually one of the smaller cohorts we have here. Think about that and go re-read the article.
and for those wondering.. not even true in the city of Pittsburgh where the largest age cohort is made up of 19 year olds, most certainly because of the young matriculants at local colleges and universities.