I truly think that an old fighter would win. Why? Lost techniques, skill, training and movement. People trained since they were a child in the old days. People could kill and get away with it because there wasn't and type of DNA scanning. I think in a life or death situation, the old fighters would win. I think an old school ninja could kill a special ops soldier. Well, then you have to take in consideration the guys who faught in nam, they had ninja skillz themselves.