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Nosebleeds can happen for a lot of reasons. In older dogs a major concern would be nasal tumors or nasal infections. Tumors can be pretty hard to find even with endoscopy and X-rays in some cases but the tests for this make it less likely.
In dogs of any age bleeding disorders need to be considered when nosebleeds occur. Ehrlichia canis, immune mediated thrombocytopenia, immune mediated hemolytic anemia and other causes of bleeding should all be considered.
In older dogs a fairly common cause of bleeding disorders is hemangiosarcoma, a type of tumor.
Heartworms can cause nosebleeds in the later stages of the disease.
Working through all these possibilities will require additional testing. It can be difficult and take several tries to identify the cause of bleeding disorders.
Let me know if you still have questions.