Thanks for the feedback. It was certainly a US flight, although the Thompson is similar. I know about the doors and the weight thereof (retired 737 captain), and I agree a person needs to be reasonably fit and agile to sit at the exits. My concern in this case is the arbitrary asumtion that a person is unfit purely by reason of their age. I think if it were tried on me on a UK flight, I'd have them up for discrimination, and take a fitness test to prove my case.