How old was the longest living German-Shepard and Saint-Banard cross dog?

There's no official record of the longest-living German Shepherd-Saint Bernard cross dog.

Here's why:

* Crossbreeds are difficult to track: Mixed breeds aren't typically registered with kennel clubs like purebred dogs. This makes it hard to track their lifespan and verify claims.

* Limited records: Even if a dog's lifespan was extraordinary, there's no central database for mixed breed longevity.

While it's fascinating to wonder, it's impossible to determine the oldest German Shepherd-Saint Bernard crossbreed without a verified record.