If I had said $100 a month people would have said Oh No We Can't Afford That! Investing 101 (it's a multi-year course so start early.) Hating capitalism is no reason not to pay attention to ways you could be one of the ones traveling in their 80s. It makes sense to try to change the world, but we also have no choice but to live in the world as it is: might as well make the best of it.

Future generations have some time ahead of them - why not see what happens. And start putting $5 a month into your 401K now if you have any taxable income at all. If that's the system we've got, might as well take advantage of it.

(Systems are not conservative or liberal; they are just headless systems. The trick is to figure out how to nudge them in one direction or another.)

Or even 50-100# of groceries with a rolling trolley

Or walk up hills, or increae the pace

For an entertaining read that looks at this question from the standpoint of mid-century philosphers, see "Metaphysical Animals"