UK Provisional Licence Does Not Expire!
Ok not quite true. The provisional licence issued in the UK does not expire until the 70th birthday of the licencee. What does expire is the provisional licence photocard photo which needs to be renewed every 10 years. You can check the date your provisional photocard licence expires, as it is the date marked 4b on your photocard licence as shown below.
You can continue to use your provisional licence to learn to drive until the age of 70, when you will need to renew the licence with the DVLA. I hope that none of you will still be learning to drive at the age of 70! Once you've passed the driving test, your full driving licence will be issued to you free of any additional costs, and the only time you will be charged for changes to your licence is if you need to have penalty points removed from either a provisional or full driving licence.
When it is time to renew your provisional photocard licence, all you need to do is complete the required form with the new passport photographs and send it off to the DVLA. Please note that you must use a colour passport photo even though all current UK provisional licences carry black and white photographs.
Don't wait till your provisional licence expires to learn to drive.