You sent me to the basement, in search of my old college grammar books . I haven't looked at them in many decades, but I DO know correct grammar usage. LOL In " ASPECTS OF AMERICAN ENGLISH " , the incorrect usage is shown by this example : He is stronger than me. This is the same sort of sentence ( replace " stronger " with " younger " , and there you have it ! ) I corrected. There are rules for all languages ; common, incorrect usage doesn't change the rules. : - )