We have DS 3 1/2 and DS 5. Don't think I'm terrible, but just HOW strict are they about the age requirement of 4 years at the on-site clubs ? We feel a little unsure about the in-room babysitting services. I know people have nothing but good things to say about them, but we would feel more comfortable with the clubs. Our sons are both big for their age, do they really question you about the ages?