Style for the Old

I was watching a fashion show over the net recently.  They were showing clothes from a British designer - all very exciting creations but nothing suitable for old aunties like myself. Why can't fashion designers include in their collection something for the middle aged, i.e. those of us who have lost our hour glass figure and have odd bulges here and there?  We would appreciate a little style now and then, you know. Another thing - I notice models wear a grim and fierce look when they sashay down the runway.  Is that how they're supposed to look?  Gives me the impression that they don't like their job.