[ITSv40]

I don't see that there is a major issue.

You have a valid licence registered to your old address, you moved and forgot to tell DVLA. You have now realised that the address needs changing and will send the details to DVLA. they ar enot going to be interested in how long you have lived at your current address.

It would be a completely different matter if you were involved in an accident or similar and the police are involved and you have to present your licence. In that scenario there is a chance they would throw the book at you.