The line of thinking on age is as follows: As you age, you have a probably smaller number of future years for which you need to worry about survival costs. And

The line of thinking on age is as follows: As you age, you have a probably smaller number of future years for which you need to worry about survival costs. And by "probably" I mean the probability is pretty well established based on millions (billions?) of data points. Death is coming for your ass. If you're 102 years old, you might live another 20 years, but I'm not wagering heavily on that. And if you're 15 you might die tomorrow in a car wreck, but the odds are that you can "expect" your "life" to be a certain length - your life expectancy. This comment is only on survival costs and age. Legacies are outside the scope of this comment. William Shatner's survival costs, having been paid-for long ago, are outside the scope of this comment.