It's probably an altcoin wallet.
These transactions are listed, but don't exist on the Bitcoin chain because the wallet is for a different cryptocurrency.

Have you ever had Litecoin, Dogecoin, DASH, etc?

3 years old uncofirmed tx!!!!!!
is this possible

Would you mind sharing the TX?
To my understanding it should be possible to "double spend" this transaction (back to your own wallet) with a sufficiently high fee so it gets confirmed.

I'm trying something similar with a stuck transaction of mine, the only problem seems to be it is still on the mempool.

Your's should be the ideal candidate to verify this approach.  

Alternatively you can simply try to broadcast the transaction again. However if it has a low fee it is unlikely to be confirmed anytime soon at the current situation (200k+ unconfirmed TX in the mempool).