She's one of the most privileged people on the planet. Her age, practically speaking, is probably closer to 60. If she wasn't fit, she wouldn't be doing it. It's not as if she is enduring pain to sit and watch the opening ceremony.
Hmm lets think 86 year old sitting for how many hours?
She got caught not smiling
It was a long tv coverage. If you're going to go obsessional about the Queen shift it to the Monarchy thread