Granny Rock

When is it time to calm down on the rocker chick thing, no matter how authentic it is for someone? The reason I ask is there was a 70+ rocker babe coming out of Cost-Co. She rocked dark purple and black short cut hair, black top, leopard shorts, fish nets, and black platforms. In her defense the rocker look was well put together but she's 70. This is a honest question. I'm sure this look makes her feel good about herself, and she was covered. What do  you think? :)