The 64-year-old leader of the Supreme Court posed a question on Wednesday that some in his generation have been asking for months: Does saying “OK, boomer” count as age discrimination? If the query hadn’t been an earnest attempt to test the bounds of a lawyer’s legal argument, Chief Justice John Roberts might have followed it up with another viral expression: “Asking for a friend.” But Roberts wasn’t typing a tweet. This was a meeting of the highest court in the land, and its nine justices - older federal employees ranging from 52 to 86 years old - were hearing a...