The salmon in his stomach — almost certainly dried or smoked, carried as provisions for a journey — is the most immediate evidence of his connection to the coast.

Someone, somewhere, had caught those salmon and prepared them for storage and travel.

Kwäday Dän Ts’ìnchi had been with those people recently enough that the evidence was still in his stomach when he died.

He was a young man or a middle-aged man or an older man — we do not know the specifics of his age at death with the precision that would allow a confident characterization.

What we know is that he was a person of sufficient experience and capability to attempt a mountain crossing, and that the attempt ended in the glacier.