Very sad.
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I will mention that we (admittedly still newer divers at about 85 dives) were a bit surprised by the advanced age of some of the divers we met there - up to and including 70's plus. I remember thinking that with that age group of divers, they must see at least a few medical issues at depth from time to time.
Last month at LCBR we had an 82 year old woman who dived 3 dives a day. She had serious shoulder surgery in May, did a trip to Cozumel in July and then came to LC in Aug. She was usually one of the first off the boat and (with her buddy) the last to return.
Most of us in what you call "advanced age" have many years of experience, and have no trouble doing 3 or more of these LC dives a day (personally, I take several liveaboard spearfishing trips a year which consist of 6/7 dives a day on my HP 119's). Because of our comfort in the water, if we have "medical issues", it is doubtful that they are due to the stress of the LC "baby dives".
What does concern me is the number of severely overweight and poorly conditioned younger divers, whose main non-diving exercise consists of waddling to the dining room and then to the bar. They are the ones who complain bitterly about that 1/4 knot current, and who take part in the sport I have named "ladder olympics" whereby they ignore all divemaster suggestions for boarding in order to explore new ways to risk injury.