It's possible that a meat eater would be healthier than a vegetarian. If someone decides to stop eating meat, and that's the only changes they make, and is one of the "I don't like fruits and veggies' type mindsets, than a meateater who eats lots of fruit and veggies with small meat consumption might actually be better off, but not because of the meat, but because of including the life-giving fruits and veggies.
I do agree, being a GOOD vegetarian is much healthier than eating animals/animal products that are the source of saturated fat, and we know where that is going to be deposited.
Will any vegetarian outlive any meat eater, even a voracious meateater who shuns veggies? The thing is, we all have our own systems and vitality level. I used to exercise all the time, while my friends sat on the couch drinking coke and eating chips. They had better muscles than I did, because it was just in their body make-up/genetics. So, I can not compare my own health to anyone elses. What I can do is take my own health/body and improve my own personal health. However long I was going to live to start with, I can increase my own chances of living longer and healthier by my choices.