In the amusement park tales, the behavior or characteristic that would make a customer unsafe or disruptive is apparent at the start of the event. It's an ovservable fact. In the case of a diver (young or old), the behavior that would warrant exclusion for safety reasons might not be apparent on the boat.
Agreed. That's why you need to see them try to get on/off the boat, see them underwater etc.
I don't think you can get away with excluding someone strictly for age when you can't demonstrate that they are factually unsafe. And you can't necessarily do that without letting them dive..
Agreed again.
Of course, an op could have a policy of excluding all people above a certain age.
I don't think that would be fair or meet my criteria of how one might diplomatically approach the issue of telling someone they were not fit to dive.
Then again, they'll be sued out of business before lunch can be served.
As to fumbling with the gear? Well, unless someone dives all the time, it may take a few seconds to clear out the cobwebs. Is that dementia? Prove it!
I can't. I'm not qualified to do so. I can only observe behaviours and speculate what is behind them.
It could be as simple as being distracted - a close family member died a couple of days ago. That kind of distraction. Or it could be the hotty across the deck; I know I would get distracted. I've been known to drool!
I think most people know when they are no longer able to dive. This just isn't a big issue. And, BTW, with the aging population guess which age group has all the money?
Richard