In the US mid 50s is nothing.Their coaches seem to go on for ever .Given the rise of assistants, no reason we cant follow the same path.There are exceptions to every rule. Lethal was a premiership coach who'd been out of it for 3 years and was still only 46.
Let's be honest , in hindsight he inherited one of the best teams of all time , he admits that freely. It wouldn't have mattered too much who coached us were we able to replicate the culture that too his credit he brought in.
Matthews and Parkin are 2 of the greatest coaches of all time and in their second stints were still in their 40's.
Ross must be 56 or 57 . I hope they have some success because their long suffering fans deserve it but I can't help but think they haven't done a thorough DD throughout this whole process. Ross has issues as everyone knows and it's critical who comes in as his backups.