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I think age and level of fitness is the key. A fresh 20-30 y.o in great shape will outlast a 60 y.o. in great shape. Cant beat father time. Walking 4 miles all night in the sand was never a problem when I was younger now I admit I get tired on the homeward stretch. On the other side of the coin as you get older wiser and more experienced you can reap more success in less time by applying learned lessons and using gained knowledge to compensate for lost stamina.
Your collar color doesnt matter.
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