People work part-time for years just to keep the benefits. Company would rather hire new young drivers than let others move forward.
More and more drivers are looking to UPS, Amazon and even Uber to find more full time driving work than FedEx.
I highly recommend another profession. The delivery service is poor, the packages are not handled well, and when they are shown dangerous working conditions in the warehouses, they routinely pass them off to save money so the managers can hopefully get their bonus at the end of the year.
Dangerous working conditions