The waiter at San Antonio’s Beat Street Coffee Co. Bistro held the large vintage door for a long time while my mother entered with her walker. The restaurant’s hipster ambiance was just what she needed as a meal break from living with 24 other people aged 80-103 at Chandler Estate Assisted Living. Needless to say, neither Mom nor I looked like the other diners. But this waiter treated us throughout the evening as if we were his target market. The food at Beat Street is terrific, each menu item offering unusual ingredient combinations. It was the kind of food that attracts the first-timers the restaurant needs for a chance to succeed. Its service, however, is what will build the repeat visitors any restaurant must win to secure its future. After our second visit Mom asked the waiter if he was the owner. “No,”…