I know of hand Asians who eat mostly plant based diets have the highest life expectancy. Take Japan for instance which has the highest life expectancy at 83
comparing life expectancies in countries isn't the whole picture. there are many factors that contribute to how long the average citizen lives like overall quality of life, access to health care, stress, standard of living, etc. africa for example consumes the least meat of anyone and they certainly aren't outliving anyone. japan eats roughly half the amount of meat as the united states but they're not exactly a vegetarian country, though they do eat a fuckton more veggies than americans. it's their general palate for food that contributes to the body's nourishment that is a major difference between them and americans.
things like steaming veggies or cooking them in broth vs frying them in oil, eating white rice vs eating shitty bleached flour white breads, eating more fish than beef, the fact that japan consumes about 66% less sugar in a particular year than the US, japan doesn't coddle children with finicky eating habits by feeding them shit food just so they'll shut up, drinking unsweetened tea vs soda, etc. to say that it's as simple as meat consumption is a copout. culturally, japan and the US are extremely different in just about every way imaginable. to reduce it to a matter of meat is really oversimplifying it.
do americans eat more red meat than is healthy? of course we do. do americans eat enough vegetables? hell no. but it's our entire diet that is in need of an overhaul, not just what types of dead things we choose to consume. i've got nothing against vegetarianism or veganism, but to prop up the argument by comparing the US to japan is borderline obscene. the american diet is almost 100% shit, with or without meat.