When we didn't have kids, but witnessed disasters with non-behaving kids at dinners, wehave been especially keen on keeping ours in line. And we have managed to go to various Michelin rated places with her starting at 18 months.
The thing with Vegas is most of the top places have a minimum age of 5 year old. We were refused despite many assurances on her being a "seasoned" diner.
So after a trip last January where the only place we were allowed in with our then 2.8 year old was Bouchon, we vowed not to return for a while (IGOTT2 withstanding).
Thanks for the kind words!