That fish isn't even close to being old aged. Still pretty young.
With that said, who knows why they die, sometimes things just die. Could be poor handling, diseases, ate something, or a million other things.
A brown that size is probably only 5 or 6 years old, and with as many fish that dwarf him, it is unlikely old age was the culprit.
Shame no matter, and a nice one.
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