I'm confused, you still have about four years to go for what? To update the whole blockchain? That will cost you extra money for data, it's better to import your private key into Electrum wallet and see if it shows up, it should though since Electrum don't need to update any blockchain data, it's always up to date
Yes, to update the whole blockchain. I don't have the receive numbers written down and I was never given a private key. I remember at one time Bitcoin Core asked me to create a private key but it was not a 12 word key and I created it, it was not given to me. This was 10 years ago. Maybe the core wallet was different back then.
So if this doesn't work, I can enter the receive numbers into my new wallet? Because I can see them on the Core wallet as the years go by. I'm not really worried about data or diskspace on that machine. Sorry, this is all new to me. I have to go back to a point in time where I left off and learn what has happened since I stopped using it I suppose. Thank you