Shelf life of leader / tippet material?

[EMSer]

So I was cleaning out some of my old fishing gear and I came across one of my old fly fishing bags. In it was a bunch of leaders / tippets. The have to be 15 - 20 years old. They have been stored in a cool / dry / dark place for all that time.

Does anyone know if they degrade over time? Can I use these or am I setting myself up for a dope slap if they break with a fish on? I hate the thought of flushing all that $ away, but I would hate having it fail under stress as well

[sega]

I found some old tippets in my uncles bass boat after dealing with his estate. These sat in his boat for probably about 5+years going through temperature changes throughout the year. Put me on my 6wt this summer and no issues going after big bass in our quarries!


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