I was taught in journalism school to mention the subject's age when possible. It doesn't take a lot of space and can be valuable information in some cases.
Well your journalism school by definition is ageist.
It's important context. It tells you a lot about the events that a person has lived through that inform their opinions. I'm too young to have any real memories of stagflation and Reaganomics, for example, but I can tell you all about the NASDAQ meltdown of '01...
Because that's what passes for hard hitting journalistic research these days.
Don't be so mean. If they report his age, they're likely to get at least one fact correct in the article.