I counted approx 50 annual growth lines in the cross-section.
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I have agreed with the id not so sure about the fruitbody being 50 years old.
I assumed that this species only had single growth period per year and that counting these would approximate age. I was shocked with the number as this species is quite a destructive white rot, even with two new grow layers a season 25y still seems wrong. This was found in a large swamp on private land so Im not doutbing it could of been unmolested for that period just doubt the tree could survive this period.
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Lat/Lng: 50.7028, -2.3164
OS grid ref: SY777892