I think that age and fine dining should not be correlated. The key determining factor should be the maturity and behaviour of the person in question. If a 3 year old can sit quietly and behave him or herself at a dinner, they should be no less welcome than an older person who can do the same. However, there are times where a young child has behaved better than a supposed adult. That being said, it the young(er) child is going to be obnoxious, run around, and scream, then they should not be allowed. My two cents worth