Thanks NickL, when you say 20,000hrs do you mean 2+ years or say 20+ years at 2.4 hrs per day? I suspect the latter but I know the bones are going to be picked. I don't imagine 105degC happening much in normal operation, so I suspect the cap will have a good chance of living well beyond that spec.
As you describe, your (presumably electrolytic) cap has lived for quite some time.