I'm sure I'll receive the hammer from some folks for this but . . .
In November of 2000 I took the keys to the kingdome tour with my daughter, aged 15 years 9 months 10 days. At that time she was about 5 feet 7 inches tall and 115 pounds. Our lovely CM/guide did not ask for her id, and that's a good thing as Massachusetts drivers' licenses weren't available then until age 16 1/2 years.
I also didn't have her passport, travelling within the USA, so she had no form of identification. If we had been challenged, I would have pointed out the Mass age requirement for a drivers' license, thus she didn't have one.
And by the way, she didn't cause a riot or anything on the tour. In fact, her favorite part of the tour was in the utilidors, when Tiggr walked by with his "head" in a bag.
Yes 16 is the stated age limit, but I felt then (and still do) that an appropriately behaved young lady of gentleman near the cutoff age was just fine. This rule isn't for health or safety, like 48 inches for Rock N Roller Coaster and its safety harness. It's to ensure all parties on the tour are well behaved.
So let me have it :>