Yo Mike,
I agree with you except for one part. I have lived my 53 years believing the best time to live life is right now, whenever now occurs. Age was never the factor. Like most of you I have had good and bad times. Things I certainly would not like to repeat but do not wish to delete as they just made the good times sweeter. I too have had my body rebuilt more times than I care to elaborate on but I have always figured out how to do what I desired. Did I mention Arthritis??
So your question about how to make things easier on certain parts of the body is particularly applicable to many of us. In addition to back braces and harnesses the single greatest thing you can do to relieve the pains associated with big fish is just to breath and relax while on the fish. Tensing up, like so many folks do, is the kiss of death for those of us with aches and pains of any kind.
If you look at David's (Wahoodad) write up and pics of his last trip on the Excel,you will see some very experienced folks, who are probably older than either of us, who show just how relaxed you should be while on a fish. Those guys were just enjoying every minute, their body language showed they were having a blast, their faces were relaxed and smiling. They were looking around and just smelling the roses. Those are attitudes all fishermen can look at and learn from. Quite different from the guy who is all serious, overly focused and tense as he pushes his way down the rail, Cranks like a maniac until he cannot crank any more and generally cannot remember much of the fight. At the end, that guy is tired and hurts like heck. Okay, a long winded way of saying relax as much as possible, keep good thoughts in your head and just enjoy the sensation of fighting a wonderful opponent. Look around and enjoy the scenery while on that fish. BREATH AND RELAX and you will be surprised at how much less you will ache.
I worked with many of the Boeing divisions so I thought perhaps I might have met you.
Best Of luck on whatever trip you choose and whatever methodology you choose.