Starting to grasp that you are at the latter half of your life tends to focus the mind wonderfully. It helps to being to (perhaps finally) cut through the layers of debris that one has allowed to clutter one's life up over the years. One comes to realize - perhaps a little late but none the less - that one really does not have the sort of time one imagined (at least here on earth, anyway) to accomplish everything.
At least for me, life is very much becoming measured in hours: how much I spend at work (too much, really), how much I sleep (not enough), and the remaining hours that are left over to pack in life (which really need to be growing in importance, not shrinking). It also means that I have been doing some level of rigorously examining the current ongoing activities in my life, in terms of time and energy and money.
Some changes are already being made. I have (realistically) the ability to really focus on two or possibly three things at a time with the hope of getting better at them. For me it means prioritizing Iai (which I have a decent chance of getting better at) at the expense of Highland Games (which I have probably just about maxed out what I can accomplish), or prioritizing a few languages I want to know better (such as Japanese and Icelandic) over the many I have always claimed that I want to know. And given the choice of running or weight lifting, I have gone with weightlifting (and walking) to save my knees.
Money tracks with all of this as well, of course. I have realized what I have blogged about many times, that I am surrounded by things for which (in most cases) I would rather have the money that I spent on them. I cannot get that money back of course, but I can make sure that I do not continue to pour good money after bad.
So change really can be good - as long as it focuses the mind.