This was big a few years back. They said in the name of Rav Elyashiv that believing the world was older than our counting is Apikorsus (supposedly it was in response to Schroeder-like Pshatim). Several Gedolei Kaballah argued back that much of Kaballah believes in an older universe. I don’t remember the entire back-and-forth, nor do I know if it was published anywhere reliable.
