I agree that uncertainty in life makes thing all the more interesting. I mean if we knew the outcome to everything what would be the point of doing anything. By having uncertainty we go and do things that we may have not otherwise had done, even if later we regret it. We at least learned something and adapt what we have learned to future things. Kenko’s mention about about the uselessness of those over forty is interesting since in that time it forty would be eighties now days. At that age your usefulness has decreased to be sure, but you as a resource of history and to grandchildren only increases.