First, let me respond to your response:
"When I was in the U.S. in 2003 I was introduced to an how shall we put it? Older married couple who were still averaging 15,000+ coins (mainly East coast beach's I think) per year between them until they had moved to live with the daughter near Williams a year or two before. Not bad if your in your seventies. They had used their detectors as a main means of exercise and getting out almost every day."... For what it's worth, that's part of the reason I get out and do what detecting I can ... exercise and relaxation.
To tally up 15,000 coins between two people is not a problem at all ...
IF, and I say it again, you have the opportune
LOCATION.
Many popular East Coast beaches would certainly qualify as that, as would some coastal beaches in Texas and California.
Additionally, as you mentioned, they were able to get out almost every day, and beach recoveries can generally be the easiest so far as time consumption. Wood chip playgrounds are a close second, many ghost town sites have fairly easy recovery with loose dirt, and then you have the probing/plugging class.
I have some friends in their late 60's to late 70's who are in far better health than I am and are able to hunt long periods and get down and dig and stand like they were in their youth! I only have memories.
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"Inland detecting/digging was to much for them but they kept the machines for any beach holiday that came up."... Glad to hear they haven't totally given up on the hobby.
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"What was interesting was that they still used old Bounty Hunter machines from the days when they were metal boxed and of course non motion, which must be years back. They never saw the need to upgrade."... While it's not a Bounty Hunter, my preferred, #1 detector is a discontinued White's IDX Pro. Also on my list of 'favorites of all time' are the
discontinued White's XL Pro,
discontinued Tesoro Bandido & Bandido II