Personally, I think there is a grey area between spending less voluntarily and spending less because you see your savings eroding or age related expenses increasing. Frankly, if money were of no concern, I'd be spending more right now. And as I age I think I'd continue to spend more and in many cases need to spend more.
Here's an example....... DW and I like wilderness experiences. This is not inexpensive recreation, but if you primarily DIY, not out of reach for most. Our canoe trips are becoming problamatic because my knees aren't cooporating on portages. We're considering hiring a guide for the next trip to do the heavy hauling, setting up camp, cooking, etc. We'll be able to spend more time fishing, taking pictures, enjoying the scenery and just enjoying the natural surroundings we love. The catch is that bringing a guide with is an $250 - $300/day incremental expense. And if we do a fly-in, we pay his/her expenses for that as well. This hardly sounds like spending less for travel as we age!
There is no end to anecdotal examples....... But the general point is that, for us, we're deciding between traveling less due to age/health related limitations and continuing to travel but spending more for services to do so.
My feeling about Bernicke is that he'd consider a decision on our part to just stay home and not spend the incremental two grand for a guide as voluntary......... We'd be spending less at our own discretion. But I think we'd be making that decision because we're worried about the expense. So Ty and I just have different outlooks on what's voluntary and what's budget mandated.
I vote for continuing to travel even if you need to pay for special services, stay in your own home even if you need to hire out all maintenance and cleaning, take in entertainment even if you need a limo to drive you there, dine out, gift the grandkids, support charities, etc., as you age. Even if it costs more to do so....... JMHO.