It has always been a sign of age. Every single man I know, knew or ever met, who wears a lip pushbroom, has always looked old. I went to school with a few chaps with staches who looked in their late twenties.
Meanwhile, I rather enjoy looking younger than my 37 years. I still get carded at liquor stores on a regular basis. This happens almost anywhere I go in the U.S. Sure, it will not last forever but the guaranteed way to stop it would be to grow a damn mustache and look 50.