I've noticed as I get older - unlike most of the older folks I know - I become less sure of myself and of the things I know. I find this a little odd, given that most people become more set in their convictions and gain more confidence as time goes by.
It seems to me, conversely, that as I have aged, I have seen a great number of strongly held convictions rendered questionable. Not broken upon the altar of fundamental flaw, but instead withered away at the edges by the growing awareness of additional information.
For most of the black-and-white scenarios, such as the issues of land and political power all over the world, I've come to appreciate their are two sides to every story. This isn't a morally relativistic stance - murder of innocents is still wrong - but ultimately from a pragmatic point of view, there is the question of whether collateral damage negates a nation's moral high ground. And if there is no moral high ground, then the justification for differentiating between the sides is often significantly fuzzier.
In interpersonal things, I've noticed that people always perceive reality differently. There really are at least three sides to any story: First person, second person, and maybe an ineffable objective truth. Or maybe the objective truth doesn't exist and we only have subjective truths. Or maybe the objective truth is really a consensus reality we share that is influenced by our subjective truths.
In complex scientific areas, such as global warming, alternative fuels, nuclear power, recycling, and so on, I've noticed that both sides seem to have some good science. I've followed both sides of these debates far enough to know both also have bad science, apologists, lobbyists, and evangelists. But there is enough reasonable science on both sides of most issues to make me realize I don't see one clear answer. And there is enough complex science for which I don't have the skills or raw data to analyze the results meaningfully, so I probably just don't know enough to have a very definite opinion.
I'm finding navigating the world is both more complex and easier as a consequence of these discoveries.
It is more complex in that I realize conclusions or beliefs are almost always suspect, so making life-directing decisions (small or large) becomes more challenging. And of course, life often does not allow you the luxury of no decision - indecision or procrastination IS a decision with consequences as well. So you end up making a fair few more decisions in a fashion to hedge your bets or in a fashion to try to put off making the final choice. And if you make a decision, it often seems like you should worry about it and revisit the decision to make sure you made the best choice.
At the same time, it has made some aspects of decision making easier. Given the complexity and shades of grey, you ARE going to get it wrong fairly regularly. So you have to learn to live with that and forgive yourself and that's a powerful aspect of personal growth. You also know that you often can't unravel the truth, so sometimes you have to decide with your gut instinct, with faith in yourself, and with acceptance that the best you can do is the best you can do, given finite time and energy.
In the net, I find myself being more cautious, more tentative in making big commitments. But I also find myself not stressing as much if I get a decision wrong because I've come to know that I will make mistakes and they are unavoidable.
I've also learned once I've recognized one of these sorts of issues as such (Global Warming as one example), to stop worrying about it much. If I can't sort out the true from the untrue or the valid from the invalid after all of my years of life and education, then I should really stop breaking my brain trying. There are areas of my life that need that attention far more and where the return on invested time is far more sure and significant. So you just let these things go and move on to focusing on the things that you can affect in a useful and more definitive fashion. I suppose that ends up working out to some form of 'think locally, act locally' in most cases.
I don't know what other folks that are aging are finding, but this has been my experience. I'd be interested to hear from others.