No, the ones we've had were, as best I can remember, a Border collie, Golden Retriever, a Golden lab, a Pointer, a Min Pin and some Chihuahuas; there's been a few others but every time we've had an intact senior, and I'm guessing, 10-12yrs., they've had reproductive tract (or mammary) cancers.
That's not to say spayed/neutered seniors are more 'healthy' per se, but they don't have reproductive tract cancers and their issues were less "severe" if you will, well, less life-threatening. I mean...fixable issues (not malignancies).
The biggest issue with altered seniors is either cardiac, skeletal or dental, and I'm guessing dental issues can lead to the other issues.
My (spayed) Libs is going on 11yrs. this spring; I've kept her teeth very clean, and she has no skeletal issues or heart issues
Let's just put it this way...any more, when we are asked to take seniors, it's not "do they have bad teeth", it's "are they altered".