the von in a German or Austrians name means "of", it was also designated as a sign of rank, more or less like being knighted. so for example the Napoleonic era Prussian general August von Gnesinau...
Hans von Bülow was born on January 8, 1830 and died on February 12, 1894. Hans von Bülow would have been 64 years old at the time of death or 182 years old today.