I have never really taken a spill while fishing, not a bad one, anyways, nor have I ever felt in danger. I think I could get myself out of dang near anything and, if not, it has been a good run.
I am only 37, though.
One day, I was fishing the Juniata by my parents and, I was on that island, and the river continued to rise. There is a pretty good amount of current there. The water comes barreling down and is pinched between that island and the shore, so the current picks up. In summer, the water is only calf deep or so. But, I was fishing high water, and I was able to wade out to the island and catch bass around it. But, as I said, the river kept rising. I had to swim back, with waders on, my sling pack, etc. I was going downriver very quickly, but I was also making it to the shore slowly. It worked out.