63-year-old man was stabbed on a Manhattan subway train Sunday after trying to hush a rowdy throng of eight women, cops said. The victim was riding south on a 6 train when he confronted the raucous group as the subway neared the 23rd St. station about 6 a.m, officials said. “The eight females were acting stupid,” a police source said. “He just told them, ‘Relax, calm down.’”