If you've moved to NSW from another Australian state or territory, you can only drive in NSW on an interstate licence for 3 months. After that period you'll need to visit a service centre and apply to transfer your licence to a NSW driver licence.
Sometimes interstate checks need to be made so allow plenty of time for a transfer to be processed.
There's no fee to transfer a current unrestricted or provisional licence. If your licence has expired, or is just about to, a fee will be charged.
Note that drivers 75 years or older are required to undergo a medical review, and may have to take a practical driving test.Find a service centre