Yep. My daughter is four and hasn't yet had meat. She's rarely sick, bounces back quickly when she is, eats a variety, just no meat. I don't think I could do vegan. She's at the age I can explain why I've made the choice to be vegetarian and she can make choices later with regard to how she would like to eat. I'm divorced and so fortunate that her dad (big meat eater) respects this decision. My parents are very conscious of what they eat (not strict vegetarians) and many kids in her pre-school are, as well so we're in good company. Crazy Californians: ) This choice was easy for me as I was raised this way for the most part and always interested in nutrition.
BTW, I have a colleague who is going to be doing her doctoral research on teens and vegan/vegetarianism. Many kids decided then to go that route without really knowing how to eat. Very interested in reading her dissertation.
Best to you!
Jen