The "Rocky" star makes a comparison with a German Shepherd and reveals why he is more relaxed today than he used to be. Hollywood star Sylvester Stallone ("Rocky"), also at the age of 80, doesn't think about stopping and wants to continue standing in front of the camera. What drives him? "I think it's just in my nature," said Stallone of the German Press Agency in London. "Ruhestand has always been too much free time for me. What should you do a…