It's not official--I haven't signed a contract yet--but a magazine has accepted my proposed nonfiction article. More later.
FYI, James A. Michener began his career as an author at age 40 and continued to publish prolifically until he was 88. And that's not counting his books that were posthumously published.
I admit I've made a few more wishes and blown out a few more birthday candles than Mr. Michener when he started. Also, his first publication at age 40 was a book, not a magazine article.